{"id":1878,"date":"2023-10-12T00:32:23","date_gmt":"2023-10-12T00:32:23","guid":{"rendered":"https:\/\/courses.lumenlearning.com\/tulsacc-precalculus\/chapter\/introduction-partial-fractions-an-application-of-systems\/"},"modified":"2023-10-24T14:05:45","modified_gmt":"2023-10-24T14:05:45","slug":"introduction-partial-fractions-an-application-of-systems","status":"publish","type":"chapter","link":"https:\/\/courses.lumenlearning.com\/tulsacc-precalculus\/chapter\/introduction-partial-fractions-an-application-of-systems\/","title":{"raw":"Partial Fractions: An Application of Systems","rendered":"Partial Fractions: An Application of Systems"},"content":{"raw":"<div class=\"textbox learning-objectives\">\r\n<h3>Learning Outcomes<\/h3>\r\n<ul class=\"ul1\">\r\n \t<li class=\"li2\"><span class=\"s1\">Decompose \u2009[latex]{\\large\\frac{P(x)}{Q(x)}}[\/latex]<\/span><span class=\"s1\">, where\u2009[latex]Q(x)[\/latex] has only nonrepeated linear factors.<\/span><\/li>\r\n \t<li class=\"li2\"><span class=\"s1\">Decompose\u2009[latex]{\\large\\frac{P(x)}{Q(x)}}[\/latex]<\/span><span class=\"s1\">,\u2009where\u2009[latex]Q(x)[\/latex]\u2009has repeated linear factors.<\/span><\/li>\r\n \t<li class=\"li2\"><span class=\"s1\">Decompose\u2009[latex]{\\large\\frac{P(x)}{Q(x)}}[\/latex],\u00a0<\/span><span class=\"s1\">where [latex]Q(x)[\/latex]\u2009has a nonrepeated irreducible quadratic factor.<\/span><\/li>\r\n \t<li class=\"li2\"><span class=\"s1\">Decompose [latex]{\\large\\frac{P(x)}{Q(x)}}[\/latex],\u00a0<\/span><span class=\"s1\">where [latex]Q(x)[\/latex]\u2009has a repeated irreducible quadratic factor.<\/span><\/li>\r\n<\/ul>\r\n<\/div>\r\nEarlier in this chapter, we studied systems of two equations in two variables, systems of three equations in three variables, and nonlinear systems. Here we introduce another way that systems of equations can be utilized\u2014the decomposition of rational expressions.\r\n\r\nFractions can be complicated; adding a variable in the denominator makes them even more so. The methods studied in this section will help simplify the concept of a rational expression.\r\n<h2>Linear Factors<\/h2>\r\nRecall the algebra regarding adding and subtracting rational expressions. These operations depend on finding a common denominator so that we can write the sum or difference as a single, simplified rational expression. In this section, we will look at <strong>partial fraction decomposition<\/strong>, which is the undoing of the procedure to add or subtract rational expressions. In other words, it is a return from the single simplified <strong>rational expression<\/strong> to the original expressions, called the <strong>partial fractions<\/strong>. Some types of rational expressions require solving a system of equations in order to decompose them, in case you were wondering what partial fractions has to do with linear systems.\r\n\r\nFor example, suppose we add the following fractions:\r\n<p style=\"text-align: center;\">[latex]\\dfrac{2}{x - 3}+\\dfrac{-1}{x+2}[\/latex]<\/p>\r\nWe would first need to find a common denominator,\r\n<p style=\"text-align: center;\">[latex]\\left(x+2\\right)\\left(x - 3\\right)[\/latex].<\/p>\r\nNext, we would write each expression with this common denominator and find the sum of the terms.\r\n<p style=\"text-align: center;\">[latex]\\begin{align} \\dfrac{x+7}{{x}^{2}-x - 6}&amp;=\\dfrac{2}{x - 3}+\\dfrac{-1}{x+2} \\\\[2mm]\\text{Simplified sum}&amp;\\hspace{6mm}\\text{Partial fraction decomposition} \\end{align}[\/latex]<\/p>\r\nPartial fraction <strong>decomposition<\/strong> is the reverse of this procedure. We would start with the solution and rewrite (decompose) it as the sum of two fractions.\r\n<p style=\"text-align: center;\">[latex]\\underset{\\begin{array}{l}\\\\ \\text{Simplified sum}\\end{array}}{\\frac{x+7}{{x}^{2}-x - 6}}=\\underset{\\begin{array}{l}\\\\ \\text{Partial fraction decomposition}\\end{array}}{\\frac{2}{x - 3}+\\frac{-1}{x+2}}[\/latex]<\/p>\r\nWe will investigate rational expressions with linear factors and quadratic factors in the denominator where the degree of the numerator is less than the degree of the denominator. Regardless of the type of expression we are decomposing, the first and most important thing to do is factor the denominator.\r\n\r\nWhen the denominator of the simplified expression contains distinct linear factors, it is likely that each of the original rational expressions, which were added or subtracted, had one of the linear factors as the denominator. In other words, using the example above, the factors of [latex]{x}^{2}-x - 6[\/latex] are [latex]\\left(x - 3\\right)\\left(x+2\\right)[\/latex], the denominators of the decomposed rational expression. So we will rewrite the simplified form as the sum of individual fractions and use a variable for each numerator. Then, we will solve for each numerator using one of several methods available for partial fraction decomposition.\r\n<div class=\"textbox\">\r\n<h3>A General Note: Partial Fraction Decomposition of [latex]\\frac{P\\left(x\\right)}{Q\\left(x\\right)}:Q\\left(x\\right)[\/latex] Has Nonrepeated Linear Factors<\/h3>\r\nThe <strong>partial fraction decomposition<\/strong> of [latex]\\dfrac{P\\left(x\\right)}{Q\\left(x\\right)}[\/latex] when [latex]Q\\left(x\\right)[\/latex] has nonrepeated linear factors and the degree of [latex]P\\left(x\\right)[\/latex] is less than the degree of [latex]Q\\left(x\\right)[\/latex] is\r\n<p style=\"text-align: center;\">[latex]\\dfrac{P\\left(x\\right)}{Q\\left(x\\right)}=\\dfrac{{A}_{1}}{\\left({a}_{1}x+{b}_{1}\\right)}+\\dfrac{{A}_{2}}{\\left({a}_{2}x+{b}_{2}\\right)}+\\dfrac{{A}_{3}}{\\left({a}_{3}x+{b}_{3}\\right)}+\\cdot \\cdot \\cdot +\\dfrac{{A}_{n}}{\\left({a}_{n}x+{b}_{n}\\right)}[\/latex].<\/p>\r\n\r\n<\/div>\r\n<div class=\"textbox\">\r\n<h3>How To: Given a rational expression with distinct linear factors in the denominator, decompose it.<\/h3>\r\n<ol>\r\n \t<li>Use a variable for the original numerators, usually [latex]A,B,[\/latex] or [latex]C[\/latex], depending on the number of factors, placing each variable over a single factor. For the purpose of this definition, we use [latex]{A}_{n}[\/latex] for each numerator\r\n<div style=\"text-align: center;\">[latex]\\dfrac{P\\left(x\\right)}{Q\\left(x\\right)}=\\dfrac{{A}_{1}}{\\left({a}_{1}x+{b}_{1}\\right)}+\\dfrac{{A}_{2}}{\\left({a}_{2}x+{b}_{2}\\right)}+\\cdots \\text{+}\\dfrac{{A}_{n}}{\\left({a}_{n}x+{b}_{n}\\right)}[\/latex]<\/div><\/li>\r\n \t<li>Multiply both sides of the equation by the common denominator to eliminate fractions.<\/li>\r\n \t<li>Expand the right side of the equation and collect like terms.<\/li>\r\n \t<li>Set coefficients of like terms from the left side of the equation equal to those on the right side to create a system of equations to solve for the numerators.<\/li>\r\n<\/ol>\r\n<\/div>\r\n<div class=\"textbox exercises\">\r\n<h3>Example: Decomposing a Rational Expression with Distinct Linear Factors<\/h3>\r\nDecompose the given <strong>rational expression<\/strong> with distinct linear factors.\r\n<p style=\"text-align: center;\">[latex]\\dfrac{3x}{\\left(x+2\\right)\\left(x - 1\\right)}[\/latex]<\/p>\r\n[reveal-answer q=\"828392\"]Show Solution[\/reveal-answer]\r\n[hidden-answer a=\"828392\"]\r\n\r\nWe will separate the denominator factors and give each numerator a symbolic label, like [latex]A,B[\/latex], or [latex]C[\/latex].\r\n<p style=\"text-align: center;\">[latex]\\dfrac{3x}{\\left(x+2\\right)\\left(x - 1\\right)}=\\dfrac{A}{\\left(x+2\\right)}+\\dfrac{B}{\\left(x - 1\\right)}[\/latex]<\/p>\r\nMultiply both sides of the equation by the common denominator to eliminate the fractions:\r\n<p style=\"text-align: center;\">[latex]\\cancel{\\left(x+2\\right)}\\cancel{\\left(x - 1\\right)}\\left[\\dfrac{3x}{\\cancel{\\left(x+2\\right)}\\cancel{\\left(x - 1\\right)}}\\right]=\\cancel{\\left(x+2\\right)}\\left(x - 1\\right)\\left[\\dfrac{A}{\\cancel{\\left(x+2\\right)}}\\right]+\\left(x+2\\right)\\cancel{\\left(x - 1\\right)}\\left[\\dfrac{B}{\\cancel{\\left(x - 1\\right)}}\\right][\/latex]<\/p>\r\nThe resulting equation is\r\n<p style=\"text-align: center;\">[latex]3x=A\\left(x - 1\\right)+B\\left(x+2\\right)[\/latex]<\/p>\r\nExpand the right side of the equation and collect like terms.\r\n<p style=\"text-align: center;\">[latex]\\begin{gathered}3x=Ax-A+Bx+2B\\\\ 3x=\\left(A+B\\right)x-A+2B\\end{gathered}[\/latex]<\/p>\r\nSet up a system of equations associating corresponding coefficients.\r\n<p style=\"text-align: center;\">[latex]\\begin{gathered}3=A+B\\\\ 0=-A+2B\\end{gathered}[\/latex]<\/p>\r\nAdd the two equations and solve for [latex]B[\/latex].\r\n<p style=\"text-align: center;\">[latex]\\begin{align}3&amp;=A+B \\\\ 0&amp;=-A+2B \\\\ \\hline 3&amp;=0+3B \\\\[4mm] B&amp;=1 \\end{align}[\/latex]<\/p>\r\nSubstitute [latex]B=1[\/latex] into one of the original equations in the system.\r\n<p style=\"text-align: center;\">[latex]\\begin{align}3&amp;=A+1\\\\ 2&amp;=A\\end{align}[\/latex]<\/p>\r\nThus, the partial fraction decomposition is\r\n<p style=\"text-align: center;\">[latex]\\dfrac{3x}{\\left(x+2\\right)\\left(x - 1\\right)}=\\dfrac{2}{\\left(x+2\\right)}+\\dfrac{1}{\\left(x - 1\\right)}[\/latex]<\/p>\r\n&nbsp;\r\n\r\nAnother method to use to solve for [latex]A[\/latex] or [latex]B[\/latex] is by considering the equation that resulted from eliminating the fractions and substituting a value for [latex]x[\/latex] that will make either the [latex]A-[\/latex]\u00a0or [latex]B-[\/latex]term equal 0. If we let [latex]x=1[\/latex], the\u00a0[latex]A-[\/latex] term becomes 0 and we can simply solve for [latex]B[\/latex].\r\n<p style=\"text-align: center;\">[latex]\\begin{align}3x&amp;=A\\left(x - 1\\right)+B\\left(x+2\\right) \\\\ 3\\left(1\\right)&amp;=A\\left[\\left(1\\right)-1\\right]+B\\left[\\left(1\\right)+2\\right] \\\\ 3&amp;=0+3B\\hfill \\\\ B&amp;=1 \\end{align}[\/latex]<\/p>\r\nNext, either substitute [latex]B=1[\/latex] into the equation and solve for [latex]A[\/latex], or make the [latex]B-[\/latex]term 0 by substituting [latex]x=-2[\/latex] into the equation.\r\n<p style=\"text-align: center;\">[latex]\\begin{align}3x&amp;=A\\left(x - 1\\right)+B\\left(x+2\\right) \\\\ 3\\left(-2\\right)&amp;=A\\left[\\left(-2\\right)-1\\right]+B\\left[\\left(-2\\right)+2\\right] \\\\ -6&amp;=-3A+0 \\\\ \\frac{-6}{-3}&amp;=A \\\\ A&amp;=2 \\end{align}[\/latex]<\/p>\r\nWe obtain the same values for [latex]A[\/latex] and [latex]B[\/latex] using either method, so the decompositions are the same using either method.\r\n<p style=\"text-align: center;\">[latex]\\dfrac{3x}{\\left(x+2\\right)\\left(x - 1\\right)}=\\dfrac{2}{\\left(x+2\\right)}+\\dfrac{1}{\\left(x - 1\\right)}[\/latex]<\/p>\r\nAlthough this method is not seen very often in textbooks, we present it here as an alternative that may make some partial fraction decompositions easier. It is known as the <strong>Heaviside method<\/strong>, named after Charles Heaviside, a pioneer in the study of electronics.\r\n\r\n[\/hidden-answer]\r\n\r\n<\/div>\r\n<div class=\"textbox key-takeaways\">\r\n<h3>Try It<\/h3>\r\nFind the partial fraction decomposition of the following expression.\r\n<p style=\"text-align: center;\">[latex]\\dfrac{x}{\\left(x - 3\\right)\\left(x - 2\\right)}[\/latex]<\/p>\r\n[reveal-answer q=\"800291\"]Show Solution[\/reveal-answer]\r\n[hidden-answer a=\"800291\"]\r\n\r\n[latex]\\dfrac{3}{x - 3}-\\dfrac{2}{x - 2}[\/latex]\r\n\r\n[\/hidden-answer]\r\n<iframe id=\"mom1\" class=\"resizable\" src=\"https:\/\/ohm.lumenlearning.com\/multiembedq.php?id=18135&amp;theme=oea&amp;iframe_resize_id=mom1\" width=\"100%\" height=\"300\"><\/iframe>\r\n\r\n<\/div>\r\nIn this video, you will see another example of how to find a partial fraction decomposition when you have linear factors.\r\n\r\nhttps:\/\/youtu.be\/WoVdOcuSI0I\r\n<h2>Decomposing P(x)\/ Q(x), Where Q(x) Has Repeated Linear Factors<\/h2>\r\nSome fractions we may come across are special cases that we can decompose into partial fractions with repeated linear factors. We must remember that we account for repeated factors by writing each factor in increasing powers.\r\n<div class=\"textbox\">\r\n<h3>A General Note: Partial Fraction Decomposition of [latex]\\frac{P\\left(x\\right)}{Q\\left(x\\right)}:Q\\left(x\\right)[\/latex] Has Repeated Linear Factors<\/h3>\r\nThe partial fraction decomposition of [latex]\\dfrac{P\\left(x\\right)}{Q\\left(x\\right)}[\/latex], when [latex]Q\\left(x\\right)[\/latex] has a repeated linear factor occurring [latex]n[\/latex] times and the degree of [latex]P\\left(x\\right)[\/latex] is less than the degree of [latex]Q\\left(x\\right)[\/latex], is\r\n<p style=\"text-align: center;\">[latex]\\dfrac{P\\left(x\\right)}{Q\\left(x\\right)}=\\dfrac{{A}_{1}}{\\left(ax+b\\right)}+\\dfrac{{A}_{2}}{{\\left(ax+b\\right)}^{2}}+\\dfrac{{A}_{3}}{{\\left(ax+b\\right)}^{3}}+\\cdot \\cdot \\cdot +\\dfrac{{A}_{n}}{{\\left(ax+b\\right)}^{n}}[\/latex]<\/p>\r\nWrite the denominator powers in increasing order.\r\n\r\n<\/div>\r\n<div class=\"textbox\">\r\n<h3>How To: Given a rational expression with repeated linear factors, decompose it.<\/h3>\r\n<ol>\r\n \t<li>Use a variable like [latex]A,B[\/latex], or [latex]C[\/latex] for the numerators and account for increasing powers of the denominators.\r\n<div style=\"text-align: center;\">[latex]\\dfrac{P\\left(x\\right)}{Q\\left(x\\right)}=\\dfrac{{A}_{1}}{\\left(ax+b\\right)}+\\dfrac{{A}_{2}}{{\\left(ax+b\\right)}^{2}}+ \\text{. }\\text{. }\\text{. + }\\dfrac{{A}_{n}}{{\\left(ax+b\\right)}^{n}}[\/latex]<\/div><\/li>\r\n \t<li>Multiply both sides of the equation by the common denominator to eliminate fractions.<\/li>\r\n \t<li>Expand the right side of the equation and collect like terms.<\/li>\r\n \t<li>Set coefficients of like terms from the left side of the equation equal to those on the right side to create a system of equations to solve for the numerators.<\/li>\r\n<\/ol>\r\n<\/div>\r\n<div class=\"textbox exercises\">\r\n<h3>Example: Decomposing with Repeated Linear Factors<\/h3>\r\nDecompose the given rational expression with repeated linear factors.\r\n<p style=\"text-align: center;\">[latex]\\dfrac{-{x}^{2}+2x+4}{{x}^{3}-4{x}^{2}+4x}[\/latex]<\/p>\r\n[reveal-answer q=\"969334\"]Show Solution[\/reveal-answer]\r\n[hidden-answer a=\"969334\"]\r\n\r\nThe denominator factors are [latex]x{\\left(x - 2\\right)}^{2}[\/latex]. To allow for the repeated factor of [latex]\\left(x - 2\\right)[\/latex], the decomposition will include three denominators: [latex]x,\\left(x - 2\\right)[\/latex], and [latex]{\\left(x - 2\\right)}^{2}[\/latex]. Thus,\r\n<p style=\"text-align: center;\">[latex]\\dfrac{-{x}^{2}+2x+4}{{x}^{3}-4{x}^{2}+4x}=\\dfrac{A}{x}+\\dfrac{B}{\\left(x - 2\\right)}+\\dfrac{C}{{\\left(x - 2\\right)}^{2}}[\/latex]<\/p>\r\nNext, we multiply both sides by the common denominator.\r\n<p style=\"text-align: center;\">[latex]\\begin{gathered}x{\\left(x - 2\\right)}^{2}\\left[\\dfrac{-{x}^{2}+2x+4}{x{\\left(x - 2\\right)}^{2}}\\right]=\\left[\\dfrac{A}{x}+\\dfrac{B}{\\left(x - 2\\right)}+\\dfrac{C}{{\\left(x - 2\\right)}^{2}}\\right]x{\\left(x - 2\\right)}^{2} \\\\[2mm] -{x}^{2}+2x+4=A{\\left(x - 2\\right)}^{2}+Bx\\left(x - 2\\right)+Cx \\end{gathered}[\/latex]<\/p>\r\nOn the right side of the equation, we expand and collect like terms.\r\n<p style=\"text-align: center;\">[latex]-{x}^{2}+2x+4=A\\left({x}^{2}-4x+4\\right)+B\\left({x}^{2}-2x\\right)+Cx[\/latex]\r\n[latex]\\begin{align}&amp;=A{x}^{2}-4Ax+4A+B{x}^{2}-2Bx+Cx \\\\ &amp;=\\left(A+B\\right){x}^{2}+\\left(-4A - 2B+C\\right)x+4A \\end{align}[\/latex]<\/p>\r\nNext we compare the coefficients of both sides. This will give the system of equations in three variables:\r\n<p style=\"text-align: center;\">[latex]-{x}^{2}+2x+4=\\left(A+B\\right){x}^{2}+\\left(-4A - 2B+C\\right)x+4A[\/latex]<\/p>\r\n<p style=\"text-align: center;\">[latex]\\begin{align} A+B&amp;=-1&amp;&amp; \\text{(1)}\\\\ -4A - 2B+C&amp;=2 &amp;&amp; \\text{(2)}\\\\ 4A&amp;=4 &amp;&amp; \\text{(3)}\\end{align}[\/latex]<\/p>\r\nSolving for [latex]A[\/latex] , we have\r\n<p style=\"text-align: center;\">[latex]\\begin{align}4A&amp;=4 \\\\ A&amp;=1 \\end{align}[\/latex]<\/p>\r\nSubstitute [latex]A=1[\/latex] into equation (1).\r\n<p style=\"text-align: center;\">[latex]\\begin{align}A+B=-1 \\\\ \\left(1\\right)+B=-1 \\\\ B=-2 \\end{align}[\/latex]<\/p>\r\nThen, to solve for [latex]C[\/latex], substitute the values for [latex]A[\/latex] and [latex]B[\/latex] into equation (2).\r\n<p style=\"text-align: center;\">[latex]\\begin{align}-4A - 2B+C=2\\\\ -4\\left(1\\right)-2\\left(-2\\right)+C=2\\\\ -4+4+C=2\\\\ C=2\\end{align}[\/latex]<\/p>\r\nThus,\r\n<p style=\"text-align: center;\">[latex]\\dfrac{-{x}^{2}+2x+4}{{x}^{3}-4{x}^{2}+4x}=\\dfrac{1}{x}-\\dfrac{2}{\\left(x - 2\\right)}+\\dfrac{2}{{\\left(x - 2\\right)}^{2}}[\/latex]<\/p>\r\n[\/hidden-answer]\r\n\r\n<\/div>\r\n<div class=\"textbox key-takeaways\">\r\n<h3>Try It<\/h3>\r\nFind the partial fraction decomposition of the expression with repeated linear factors.\r\n<p style=\"text-align: center;\">[latex]\\dfrac{6x - 11}{{\\left(x - 1\\right)}^{2}}[\/latex]<\/p>\r\n[reveal-answer q=\"623632\"]Show Solution[\/reveal-answer]\r\n[hidden-answer a=\"623632\"]\r\n\r\n[latex]\\dfrac{6}{x - 1}-\\dfrac{5}{{\\left(x - 1\\right)}^{2}}[\/latex]\r\n\r\n[\/hidden-answer]\r\n\r\n<\/div>\r\nIn this video, you will see an example of how to find the partial fraction decomposition of a rational expression with repeated linear factors.\r\n\r\nhttps:\/\/youtu.be\/6DdwGw_5dvk\r\n<h2>Quadratic Factors<\/h2>\r\nSo far we have performed partial fraction decomposition with expressions that have had linear factors in the denominator, and we applied numerators [latex]A,B[\/latex], or [latex]C[\/latex] representing constants. Now we will look at an example where one of the factors in the denominator is a <strong><span class=\"no-emphasis\">quadratic<\/span><\/strong> expression that does not factor. This is referred to as an irreducible quadratic factor. In cases like this, we use a linear numerator such as [latex]Ax+B,Bx+C[\/latex], etc.\r\n<div class=\"textbox\">\r\n<h3>A General Note: Decomposition of [latex]\\frac{P\\left(x\\right)}{Q\\left(x\\right)}:Q\\left(x\\right)[\/latex] Has a Nonrepeated Irreducible Quadratic Factor<\/h3>\r\nThe partial fraction decomposition of [latex]\\dfrac{P\\left(x\\right)}{Q\\left(x\\right)}[\/latex] such that [latex]Q\\left(x\\right)[\/latex] has a nonrepeated irreducible quadratic factor and the degree of [latex]P\\left(x\\right)[\/latex] is less than the degree of [latex]Q\\left(x\\right)[\/latex] is written as\r\n<p style=\"text-align: center;\">[latex]\\dfrac{P\\left(x\\right)}{Q\\left(x\\right)}=\\dfrac{{A}_{1}x+{B}_{1}}{\\left({a}_{1}{x}^{2}+{b}_{1}x+{c}_{1}\\right)}+\\dfrac{{A}_{2}x+{B}_{2}}{\\left({a}_{2}{x}^{2}+{b}_{2}x+{c}_{2}\\right)}+\\cdot \\cdot \\cdot +\\dfrac{{A}_{n}x+{B}_{n}}{\\left({a}_{n}{x}^{2}+{b}_{n}x+{c}_{n}\\right)}[\/latex]<\/p>\r\nThe decomposition may contain more rational expressions if there are linear factors. Each linear factor will have a different constant numerator: [latex]A,B,C[\/latex], and so on.\r\n\r\n<\/div>\r\n<div class=\"textbox\">\r\n<h3>How To: Given a rational expression where the factors of the denominator are distinct, irreducible quadratic factors, decompose it.<\/h3>\r\n<ol>\r\n \t<li>Use variables such as [latex]A,B[\/latex], or [latex]C[\/latex] for the constant numerators over linear factors, and linear expressions such as [latex]{A}_{1}x+{B}_{1},{A}_{2}x+{B}_{2}[\/latex], etc., for the numerators of each quadratic factor in the denominator.\r\n<div style=\"text-align: center;\">[latex]\\dfrac{P\\left(x\\right)}{Q\\left(x\\right)}=\\dfrac{A}{ax+b}+\\dfrac{{A}_{1}x+{B}_{1}}{\\left({a}_{1}{x}^{2}+{b}_{1}x+{c}_{1}\\right)}+\\dfrac{{A}_{2}x+{B}_{2}}{\\left({a}_{2}{x}^{2}+{b}_{2}x+{c}_{2}\\right)}+\\cdot \\cdot \\cdot +\\dfrac{{A}_{n}x+{B}_{n}}{\\left({a}_{n}{x}^{2}+{b}_{n}x+{c}_{n}\\right)}[\/latex]<\/div><\/li>\r\n \t<li>Multiply both sides of the equation by the common denominator to eliminate fractions.<\/li>\r\n \t<li>Expand the right side of the equation and collect like terms.<\/li>\r\n \t<li>Set coefficients of like terms from the left side of the equation equal to those on the right side to create a system of equations to solve for the numerators.<\/li>\r\n<\/ol>\r\n<\/div>\r\n<div class=\"textbox exercises\">\r\n<h3>Example: Decomposing [latex]\\frac{P\\left(x\\right)}{Q\\left(x\\right)}[\/latex] When <em>Q(x)<\/em> Contains a Nonrepeated Irreducible Quadratic Factor<\/h3>\r\nFind a partial fraction decomposition of the given expression.\r\n<p style=\"text-align: center;\">[latex]\\dfrac{8{x}^{2}+12x - 20}{\\left(x+3\\right)\\left({x}^{2}+x+2\\right)}[\/latex]<\/p>\r\n[reveal-answer q=\"785023\"]Show Solution[\/reveal-answer]\r\n[hidden-answer a=\"785023\"]\r\n\r\nWe have one linear factor and one irreducible quadratic factor in the denominator, so one numerator will be a constant and the other numerator will be a linear expression. Thus,\r\n<p style=\"text-align: center;\">[latex]\\dfrac{8{x}^{2}+12x - 20}{\\left(x+3\\right)\\left({x}^{2}+x+2\\right)}=\\dfrac{A}{\\left(x+3\\right)}+\\dfrac{Bx+C}{\\left({x}^{2}+x+2\\right)}[\/latex]<\/p>\r\nWe follow the same steps as in previous problems. First, clear the fractions by multiplying both sides of the equation by the common denominator.\r\n<p style=\"text-align: center;\">[latex]\\begin{align}\\left(x+3\\right)\\left({x}^{2}+x+2\\right)\\left[\\frac{8{x}^{2}+12x - 20}{\\left(x+3\\right)\\left({x}^{2}+x+2\\right)}\\right]&amp;=\\left[\\frac{A}{\\left(x+3\\right)}+\\frac{Bx+C}{\\left({x}^{2}+x+2\\right)}\\right]\\left(x+3\\right)\\left({x}^{2}+x+2\\right) \\\\[2mm] 8{x}^{2}+12x - 20&amp;=A\\left({x}^{2}+x+2\\right)+\\left(Bx+C\\right)\\left(x+3\\right) \\end{align}[\/latex]<\/p>\r\nNotice we could easily solve for [latex]A[\/latex] by choosing a value for [latex]x[\/latex] that will make the [latex]Bx+C[\/latex] term equal 0. Let [latex]x=-3[\/latex] and substitute it into the equation.\r\n<p style=\"text-align: center;\">[latex]\\begin{align}8{x}^{2}+12x - 20&amp;=A\\left({x}^{2}+x+2\\right)+\\left(Bx+C\\right)\\left(x+3\\right) \\\\ 8{\\left(-3\\right)}^{2}+12\\left(-3\\right)-20&amp;=A\\left({\\left(-3\\right)}^{2}+\\left(-3\\right)+2\\right)+\\left(B\\left(-3\\right)+C\\right)\\left(\\left(-3\\right)+3\\right) \\\\ 16&amp;=8A \\\\ A&amp;=2 \\end{align}[\/latex]<\/p>\r\nNow that we know the value of [latex]A[\/latex], substitute it back into the equation. Then expand the right side and collect like terms.\r\n<p style=\"text-align: center;\">[latex]\\begin{align} &amp;8{x}^{2}+12x - 20=2\\left({x}^{2}+x+2\\right)+\\left(Bx+C\\right)\\left(x+3\\right) \\\\ &amp;8{x}^{2}+12x - 20=2{x}^{2}+2x+4+B{x}^{2}+3B+Cx+3C \\\\ &amp;8{x}^{2}+12x - 20=\\left(2+B\\right){x}^{2}+\\left(2+3B+C\\right)x+\\left(4+3C\\right) \\end{align}[\/latex]<\/p>\r\nSetting the coefficients of terms on the right side equal to the coefficients of terms on the left side gives the system of equations.\r\n<p style=\"text-align: center;\">[latex]\\begin{align}2+B=8 &amp;&amp; \\text{(1)} \\\\ 2+3B+C=12 &amp;&amp; \\text{(2)} \\\\ 4+3C=-20 &amp;&amp; \\text{(3)} \\end{align}[\/latex]<\/p>\r\nSolve for [latex]B[\/latex] using equation (1) and solve for [latex]C[\/latex] using equation (3).\r\n<p style=\"text-align: center;\">[latex]\\begin{align}2+B=8 &amp;&amp; \\text{(1)} \\\\ B=6 \\\\ \\\\ 4+3C=-20 &amp;&amp; \\text{(3)} \\\\ 3C=-24 \\\\ C=-8 \\end{align}[\/latex]<\/p>\r\nThus, the partial fraction decomposition of the expression is\r\n<p style=\"text-align: center;\">[latex]\\dfrac{8{x}^{2}+12x - 20}{\\left(x+3\\right)\\left({x}^{2}+x+2\\right)}=\\dfrac{2}{\\left(x+3\\right)}+\\dfrac{6x - 8}{\\left({x}^{2}+x+2\\right)}[\/latex]<\/p>\r\n[\/hidden-answer]\r\n\r\n<\/div>\r\n<div class=\"textbox\">\r\n<h3>Q &amp; A<\/h3>\r\n<h4>Could we have just set up a system of equations to solve Example 3?<\/h4>\r\n<em>Yes, we could have solved it by setting up a system of equations without solving for [latex]A[\/latex] first. The expansion on the right would be:<\/em>\r\n<p style=\"text-align: center;\">[latex]\\begin{align} 8{x}^{2}+12x - 20&amp;=A{x}^{2}+Ax+2A+B{x}^{2}+3B+Cx+3C \\\\ 8{x}^{2}+12x - 20&amp;=\\left(A+B\\right){x}^{2}+\\left(A+3B+C\\right)x+\\left(2A+3C\\right) \\end{align}[\/latex]<\/p>\r\n<em>So the system of equations would be:<\/em>\r\n<p style=\"text-align: center;\">[latex]\\begin{align}A+B=8 \\\\ A+3B+C=12 \\\\ 2A+3C=-20 \\end{align}[\/latex]<\/p>\r\n\r\n<\/div>\r\n<div class=\"textbox key-takeaways\">\r\n<h3>Try It<\/h3>\r\nFind the partial fraction decomposition of the expression with a nonrepeating irreducible quadratic factor.\r\n<p style=\"text-align: center;\">[latex]\\dfrac{5{x}^{2}-6x+7}{\\left(x - 1\\right)\\left({x}^{2}+1\\right)}[\/latex]<\/p>\r\n[reveal-answer q=\"163296\"]Show Solution[\/reveal-answer]\r\n[hidden-answer a=\"163296\"]\r\n\r\n[latex]\\dfrac{3}{x - 1}+\\dfrac{2x - 4}{{x}^{2}+1}[\/latex]\r\n\r\n[\/hidden-answer]\r\n<iframe id=\"mom1\" class=\"resizable\" src=\"https:\/\/ohm.lumenlearning.com\/multiembedq.php?id=18139&amp;theme=oea&amp;iframe_resize_id=mom1\" width=\"100%\" height=\"300\"><\/iframe>\r\n\r\n<\/div>\r\nIn the following video, you will see another example of how to find the partial fraction decomposition for a rational expression that has quadratic factors.\r\n\r\nhttps:\/\/youtu.be\/prtx4o1wbaQ\r\n<h2>Decomposing P(x) \/ Q(x), When Q(x) Has a Repeated Irreducible Quadratic Factor<\/h2>\r\nNow that we can decompose a simplified <strong>rational expression<\/strong> with an irreducible <strong>quadratic<\/strong> factor, we will learn how to do partial fraction decomposition when the simplified rational expression has repeated irreducible quadratic factors. The decomposition will consist of partial fractions with linear numerators over each irreducible quadratic factor represented in increasing powers.\r\n<div class=\"textbox\">\r\n<h3>A General Note: Decomposition of [latex]\\frac{P\\left(x\\right)}{Q\\left(x\\right)}[\/latex] When <em>Q(x)<\/em> Has a Repeated Irreducible Quadratic Factor<\/h3>\r\nThe partial fraction decomposition of [latex]\\dfrac{P\\left(x\\right)}{Q\\left(x\\right)}[\/latex], when [latex]Q\\left(x\\right)[\/latex] has a repeated irreducible quadratic factor and the degree of [latex]P\\left(x\\right)[\/latex] is less than the degree of [latex]Q\\left(x\\right)[\/latex], is\r\n<p style=\"text-align: center;\">[latex]\\dfrac{P\\left(x\\right)}{{\\left(a{x}^{2}+bx+c\\right)}^{n}}=\\dfrac{{A}_{1}x+{B}_{1}}{\\left(a{x}^{2}+bx+c\\right)}+\\dfrac{{A}_{2}x+{B}_{2}}{{\\left(a{x}^{2}+bx+c\\right)}^{2}}+\\dfrac{{A}_{3}x+{B}_{3}}{{\\left(a{x}^{2}+bx+c\\right)}^{3}}+\\cdot \\cdot \\cdot +\\dfrac{{A}_{n}x+{B}_{n}}{{\\left(a{x}^{2}+bx+c\\right)}^{n}}[\/latex]<\/p>\r\nWrite the denominators in increasing powers.\r\n\r\n<\/div>\r\n<div class=\"textbox\">\r\n<h3>How To: Given a rational expression that has a repeated irreducible factor, decompose it.<\/h3>\r\n<ol>\r\n \t<li>Use variables like [latex]A,B[\/latex], or [latex]C[\/latex] for the constant numerators over linear factors, and linear expressions such as [latex]{A}_{1}x+{B}_{1},{A}_{2}x+{B}_{2}[\/latex], etc., for the numerators of each quadratic factor in the denominator written in increasing powers, such as\r\n<div style=\"text-align: center;\">[latex]\\dfrac{P\\left(x\\right)}{Q\\left(x\\right)}=\\dfrac{A}{ax+b}+\\dfrac{{A}_{1}x+{B}_{1}}{\\left(a{x}^{2}+bx+c\\right)}+\\dfrac{{A}_{2}x+{B}_{2}}{{\\left(a{x}^{2}+bx+c\\right)}^{2}}+\\cdots +\\text{ }\\dfrac{{A}_{n}+{B}_{n}}{{\\left(a{x}^{2}+bx+c\\right)}^{n}}[\/latex]<\/div><\/li>\r\n \t<li>Multiply both sides of the equation by the common denominator to eliminate fractions.<\/li>\r\n \t<li>Expand the right side of the equation and collect like terms.<\/li>\r\n \t<li>Set coefficients of like terms from the left side of the equation equal to those on the right side to create a system of equations to solve for the numerators.<\/li>\r\n<\/ol>\r\n<\/div>\r\n<div class=\"textbox exercises\">\r\n<h3>Example: Decomposing a Rational Function with a Repeated Irreducible Quadratic Factor in the Denominator<\/h3>\r\nDecompose the given expression that has a repeated irreducible factor in the denominator.\r\n<p style=\"text-align: center;\">[latex]\\dfrac{{x}^{4}+{x}^{3}+{x}^{2}-x+1}{x{\\left({x}^{2}+1\\right)}^{2}}[\/latex]<\/p>\r\n[reveal-answer q=\"901003\"]Show Solution[\/reveal-answer]\r\n[hidden-answer a=\"901003\"]\r\n\r\nThe factors of the denominator are [latex]x,\\left({x}^{2}+1\\right)[\/latex], and [latex]{\\left({x}^{2}+1\\right)}^{2}[\/latex]. Recall that, when a factor in the denominator is a quadratic that includes at least two terms, the numerator must be of the linear form [latex]Ax+B[\/latex]. So, let\u2019s begin the decomposition.\r\n<p style=\"text-align: center;\">[latex]\\dfrac{{x}^{4}+{x}^{3}+{x}^{2}-x+1}{x{\\left({x}^{2}+1\\right)}^{2}}=\\dfrac{A}{x}+\\dfrac{Bx+C}{\\left({x}^{2}+1\\right)}+\\dfrac{Dx+E}{{\\left({x}^{2}+1\\right)}^{2}}[\/latex]<\/p>\r\nWe eliminate the denominators by multiplying each term by [latex]x{\\left({x}^{2}+1\\right)}^{2}[\/latex]. Thus,\r\n<p style=\"text-align: center;\">[latex]{x}^{4}+{x}^{3}+{x}^{2}-x+1=A{\\left({x}^{2}+1\\right)}^{2}+\\left(Bx+C\\right)\\left(x\\right)\\left({x}^{2}+1\\right)+\\left(Dx+E\\right)\\left(x\\right)[\/latex]<\/p>\r\nExpand the right side.\r\n<p style=\"text-align: center;\">[latex]\\begin{align}&amp;{x}^{4}+{x}^{3}+{x}^{2}-x+1=A\\left({x}^{4}+2{x}^{2}+1\\right)+B{x}^{4}+B{x}^{2}+C{x}^{3}+Cx+D{x}^{2}+Ex \\\\ &amp;=A{x}^{4}+2A{x}^{2}+A+B{x}^{4}+B{x}^{2}+C{x}^{3}+Cx+D{x}^{2}+Ex \\end{align}[\/latex]<\/p>\r\nNow we will collect like terms.\r\n<p style=\"text-align: center;\">[latex]{x}^{4}+{x}^{3}+{x}^{2}-x+1=\\left(A+B\\right){x}^{4}+\\left(C\\right){x}^{3}+\\left(2A+B+D\\right){x}^{2}+\\left(C+E\\right)x+A[\/latex]<\/p>\r\nSet up the system of equations matching corresponding coefficients on each side of the equal sign.\r\n<p style=\"text-align: center;\">[latex]\\begin{align}A+B=1 \\\\ C=1 \\\\ \\\\ 2A+B+D=1 \\\\ C+E=-1 \\\\ A=1 \\end{align}[\/latex]<\/p>\r\nWe can use substitution from this point. Substitute [latex]A=1[\/latex] into the first equation.\r\n<p style=\"text-align: center;\">[latex]\\begin{align}1+B=1 \\\\ B=0 \\end{align}[\/latex]<\/p>\r\nSubstitute [latex]A=1[\/latex] and [latex]B=0[\/latex] into the third equation.\r\n<p style=\"text-align: center;\">[latex]\\begin{align}2\\left(1\\right)+0+D=1 \\\\ D=-1 \\end{align}[\/latex]<\/p>\r\nSubstitute [latex]C=1[\/latex] into the fourth equation.\r\n<p style=\"text-align: center;\">[latex]\\begin{align} 1+E=-1\\\\ E=-2\\end{align}[\/latex]<\/p>\r\nNow we have solved for all of the unknowns on the right side of the equal sign. We have [latex]A=1[\/latex], [latex]B=0[\/latex], [latex]C=1[\/latex], [latex]D=-1[\/latex], and [latex]E=-2[\/latex]. We can write the decomposition as follows:\r\n<p style=\"text-align: center;\">[latex]\\dfrac{{x}^{4}+{x}^{3}+{x}^{2}-x+1}{x{\\left({x}^{2}+1\\right)}^{2}}=\\dfrac{1}{x}+\\dfrac{1}{\\left({x}^{2}+1\\right)}-\\dfrac{x+2}{{\\left({x}^{2}+1\\right)}^{2}}[\/latex]<\/p>\r\n[\/hidden-answer]\r\n\r\n<\/div>\r\n<div class=\"textbox key-takeaways\">\r\n<h3>Try It<\/h3>\r\nFind the partial fraction decomposition of the expression with a repeated irreducible quadratic factor.\r\n<p style=\"text-align: center;\">[latex]\\dfrac{{x}^{3}-4{x}^{2}+9x - 5}{{\\left({x}^{2}-2x+3\\right)}^{2}}[\/latex]<\/p>\r\n[reveal-answer q=\"741991\"]Show Solution[\/reveal-answer]\r\n[hidden-answer a=\"741991\"]\r\n\r\n[latex]\\dfrac{x - 2}{{x}^{2}-2x+3}+\\dfrac{2x+1}{{\\left({x}^{2}-2x+3\\right)}^{2}}[\/latex]\r\n\r\n[\/hidden-answer]\r\n\r\n<\/div>\r\nThis video provides you with another worked example of how to find the partial fraction decomposition for a rational expression that has repeating quadratic factors.\r\n\r\nhttps:\/\/youtu.be\/Dupeou-FDnI\r\n<h2>Key Concepts<\/h2>\r\n<ul>\r\n \t<li>Decompose [latex]\\frac{P\\left(x\\right)}{Q\\left(x\\right)}[\/latex] by writing the partial fractions as [latex]\\frac{A}{{a}_{1}x+{b}_{1}}+\\frac{B}{{a}_{2}x+{b}_{2}}[\/latex]. Solve by clearing the fractions, expanding the right side, collecting like terms, and setting corresponding coefficients equal to each other, then setting up and solving a system of equations.<\/li>\r\n \t<li>The decomposition of [latex]\\frac{P\\left(x\\right)}{Q\\left(x\\right)}[\/latex] with repeated linear factors must account for the factors of the denominator in increasing powers.<\/li>\r\n \t<li>The decomposition of [latex]\\frac{P\\left(x\\right)}{Q\\left(x\\right)}[\/latex] with a nonrepeated irreducible quadratic factor needs a linear numerator over the quadratic factor, as in [latex]\\frac{A}{x}+\\frac{Bx+C}{\\left(a{x}^{2}+bx+c\\right)}[\/latex].<\/li>\r\n \t<li>In the decomposition of [latex]\\frac{P\\left(x\\right)}{Q\\left(x\\right)}[\/latex], where [latex]Q\\left(x\\right)[\/latex] has a repeated irreducible quadratic factor, when the irreducible quadratic factors are repeated, powers of the denominator factors must be represented in increasing powers as\r\n<p style=\"text-align: center;\">[latex]\\frac{Ax+B}{\\left(a{x}^{2}+bx+c\\right)}+\\frac{{A}_{2}x+{B}_{2}}{{\\left(a{x}^{2}+bx+c\\right)}^{2}}+\\cdots \\text{+}\\frac{{A}_{n}x+{B}_{n}}{{\\left(a{x}^{2}+bx+c\\right)}^{n}}[\/latex].<\/p>\r\n<\/li>\r\n<\/ul>\r\n<h2>Glossary<\/h2>\r\n<strong>partial fractions<\/strong> the individual fractions that make up the sum or difference of a rational expression before combining them into a simplified rational expression\r\n\r\n<strong>partial fraction decomposition<\/strong> the process of returning a simplified rational expression to its original form, a sum or difference of simpler rational expressions","rendered":"<div class=\"textbox learning-objectives\">\n<h3>Learning Outcomes<\/h3>\n<ul class=\"ul1\">\n<li class=\"li2\"><span class=\"s1\">Decompose \u2009[latex]{\\large\\frac{P(x)}{Q(x)}}[\/latex]<\/span><span class=\"s1\">, where\u2009[latex]Q(x)[\/latex] has only nonrepeated linear factors.<\/span><\/li>\n<li class=\"li2\"><span class=\"s1\">Decompose\u2009[latex]{\\large\\frac{P(x)}{Q(x)}}[\/latex]<\/span><span class=\"s1\">,\u2009where\u2009[latex]Q(x)[\/latex]\u2009has repeated linear factors.<\/span><\/li>\n<li class=\"li2\"><span class=\"s1\">Decompose\u2009[latex]{\\large\\frac{P(x)}{Q(x)}}[\/latex],\u00a0<\/span><span class=\"s1\">where [latex]Q(x)[\/latex]\u2009has a nonrepeated irreducible quadratic factor.<\/span><\/li>\n<li class=\"li2\"><span class=\"s1\">Decompose [latex]{\\large\\frac{P(x)}{Q(x)}}[\/latex],\u00a0<\/span><span class=\"s1\">where [latex]Q(x)[\/latex]\u2009has a repeated irreducible quadratic factor.<\/span><\/li>\n<\/ul>\n<\/div>\n<p>Earlier in this chapter, we studied systems of two equations in two variables, systems of three equations in three variables, and nonlinear systems. Here we introduce another way that systems of equations can be utilized\u2014the decomposition of rational expressions.<\/p>\n<p>Fractions can be complicated; adding a variable in the denominator makes them even more so. The methods studied in this section will help simplify the concept of a rational expression.<\/p>\n<h2>Linear Factors<\/h2>\n<p>Recall the algebra regarding adding and subtracting rational expressions. These operations depend on finding a common denominator so that we can write the sum or difference as a single, simplified rational expression. In this section, we will look at <strong>partial fraction decomposition<\/strong>, which is the undoing of the procedure to add or subtract rational expressions. In other words, it is a return from the single simplified <strong>rational expression<\/strong> to the original expressions, called the <strong>partial fractions<\/strong>. Some types of rational expressions require solving a system of equations in order to decompose them, in case you were wondering what partial fractions has to do with linear systems.<\/p>\n<p>For example, suppose we add the following fractions:<\/p>\n<p style=\"text-align: center;\">[latex]\\dfrac{2}{x - 3}+\\dfrac{-1}{x+2}[\/latex]<\/p>\n<p>We would first need to find a common denominator,<\/p>\n<p style=\"text-align: center;\">[latex]\\left(x+2\\right)\\left(x - 3\\right)[\/latex].<\/p>\n<p>Next, we would write each expression with this common denominator and find the sum of the terms.<\/p>\n<p style=\"text-align: center;\">[latex]\\begin{align} \\dfrac{x+7}{{x}^{2}-x - 6}&=\\dfrac{2}{x - 3}+\\dfrac{-1}{x+2} \\\\[2mm]\\text{Simplified sum}&\\hspace{6mm}\\text{Partial fraction decomposition} \\end{align}[\/latex]<\/p>\n<p>Partial fraction <strong>decomposition<\/strong> is the reverse of this procedure. We would start with the solution and rewrite (decompose) it as the sum of two fractions.<\/p>\n<p style=\"text-align: center;\">[latex]\\underset{\\begin{array}{l}\\\\ \\text{Simplified sum}\\end{array}}{\\frac{x+7}{{x}^{2}-x - 6}}=\\underset{\\begin{array}{l}\\\\ \\text{Partial fraction decomposition}\\end{array}}{\\frac{2}{x - 3}+\\frac{-1}{x+2}}[\/latex]<\/p>\n<p>We will investigate rational expressions with linear factors and quadratic factors in the denominator where the degree of the numerator is less than the degree of the denominator. Regardless of the type of expression we are decomposing, the first and most important thing to do is factor the denominator.<\/p>\n<p>When the denominator of the simplified expression contains distinct linear factors, it is likely that each of the original rational expressions, which were added or subtracted, had one of the linear factors as the denominator. In other words, using the example above, the factors of [latex]{x}^{2}-x - 6[\/latex] are [latex]\\left(x - 3\\right)\\left(x+2\\right)[\/latex], the denominators of the decomposed rational expression. So we will rewrite the simplified form as the sum of individual fractions and use a variable for each numerator. Then, we will solve for each numerator using one of several methods available for partial fraction decomposition.<\/p>\n<div class=\"textbox\">\n<h3>A General Note: Partial Fraction Decomposition of [latex]\\frac{P\\left(x\\right)}{Q\\left(x\\right)}:Q\\left(x\\right)[\/latex] Has Nonrepeated Linear Factors<\/h3>\n<p>The <strong>partial fraction decomposition<\/strong> of [latex]\\dfrac{P\\left(x\\right)}{Q\\left(x\\right)}[\/latex] when [latex]Q\\left(x\\right)[\/latex] has nonrepeated linear factors and the degree of [latex]P\\left(x\\right)[\/latex] is less than the degree of [latex]Q\\left(x\\right)[\/latex] is<\/p>\n<p style=\"text-align: center;\">[latex]\\dfrac{P\\left(x\\right)}{Q\\left(x\\right)}=\\dfrac{{A}_{1}}{\\left({a}_{1}x+{b}_{1}\\right)}+\\dfrac{{A}_{2}}{\\left({a}_{2}x+{b}_{2}\\right)}+\\dfrac{{A}_{3}}{\\left({a}_{3}x+{b}_{3}\\right)}+\\cdot \\cdot \\cdot +\\dfrac{{A}_{n}}{\\left({a}_{n}x+{b}_{n}\\right)}[\/latex].<\/p>\n<\/div>\n<div class=\"textbox\">\n<h3>How To: Given a rational expression with distinct linear factors in the denominator, decompose it.<\/h3>\n<ol>\n<li>Use a variable for the original numerators, usually [latex]A,B,[\/latex] or [latex]C[\/latex], depending on the number of factors, placing each variable over a single factor. For the purpose of this definition, we use [latex]{A}_{n}[\/latex] for each numerator\n<div style=\"text-align: center;\">[latex]\\dfrac{P\\left(x\\right)}{Q\\left(x\\right)}=\\dfrac{{A}_{1}}{\\left({a}_{1}x+{b}_{1}\\right)}+\\dfrac{{A}_{2}}{\\left({a}_{2}x+{b}_{2}\\right)}+\\cdots \\text{+}\\dfrac{{A}_{n}}{\\left({a}_{n}x+{b}_{n}\\right)}[\/latex]<\/div>\n<\/li>\n<li>Multiply both sides of the equation by the common denominator to eliminate fractions.<\/li>\n<li>Expand the right side of the equation and collect like terms.<\/li>\n<li>Set coefficients of like terms from the left side of the equation equal to those on the right side to create a system of equations to solve for the numerators.<\/li>\n<\/ol>\n<\/div>\n<div class=\"textbox exercises\">\n<h3>Example: Decomposing a Rational Expression with Distinct Linear Factors<\/h3>\n<p>Decompose the given <strong>rational expression<\/strong> with distinct linear factors.<\/p>\n<p style=\"text-align: center;\">[latex]\\dfrac{3x}{\\left(x+2\\right)\\left(x - 1\\right)}[\/latex]<\/p>\n<div class=\"qa-wrapper\" style=\"display: block\"><span class=\"show-answer collapsed\" style=\"cursor: pointer\" data-target=\"q828392\">Show Solution<\/span><\/p>\n<div id=\"q828392\" class=\"hidden-answer\" style=\"display: none\">\n<p>We will separate the denominator factors and give each numerator a symbolic label, like [latex]A,B[\/latex], or [latex]C[\/latex].<\/p>\n<p style=\"text-align: center;\">[latex]\\dfrac{3x}{\\left(x+2\\right)\\left(x - 1\\right)}=\\dfrac{A}{\\left(x+2\\right)}+\\dfrac{B}{\\left(x - 1\\right)}[\/latex]<\/p>\n<p>Multiply both sides of the equation by the common denominator to eliminate the fractions:<\/p>\n<p style=\"text-align: center;\">[latex]\\cancel{\\left(x+2\\right)}\\cancel{\\left(x - 1\\right)}\\left[\\dfrac{3x}{\\cancel{\\left(x+2\\right)}\\cancel{\\left(x - 1\\right)}}\\right]=\\cancel{\\left(x+2\\right)}\\left(x - 1\\right)\\left[\\dfrac{A}{\\cancel{\\left(x+2\\right)}}\\right]+\\left(x+2\\right)\\cancel{\\left(x - 1\\right)}\\left[\\dfrac{B}{\\cancel{\\left(x - 1\\right)}}\\right][\/latex]<\/p>\n<p>The resulting equation is<\/p>\n<p style=\"text-align: center;\">[latex]3x=A\\left(x - 1\\right)+B\\left(x+2\\right)[\/latex]<\/p>\n<p>Expand the right side of the equation and collect like terms.<\/p>\n<p style=\"text-align: center;\">[latex]\\begin{gathered}3x=Ax-A+Bx+2B\\\\ 3x=\\left(A+B\\right)x-A+2B\\end{gathered}[\/latex]<\/p>\n<p>Set up a system of equations associating corresponding coefficients.<\/p>\n<p style=\"text-align: center;\">[latex]\\begin{gathered}3=A+B\\\\ 0=-A+2B\\end{gathered}[\/latex]<\/p>\n<p>Add the two equations and solve for [latex]B[\/latex].<\/p>\n<p style=\"text-align: center;\">[latex]\\begin{align}3&=A+B \\\\ 0&=-A+2B \\\\ \\hline 3&=0+3B \\\\[4mm] B&=1 \\end{align}[\/latex]<\/p>\n<p>Substitute [latex]B=1[\/latex] into one of the original equations in the system.<\/p>\n<p style=\"text-align: center;\">[latex]\\begin{align}3&=A+1\\\\ 2&=A\\end{align}[\/latex]<\/p>\n<p>Thus, the partial fraction decomposition is<\/p>\n<p style=\"text-align: center;\">[latex]\\dfrac{3x}{\\left(x+2\\right)\\left(x - 1\\right)}=\\dfrac{2}{\\left(x+2\\right)}+\\dfrac{1}{\\left(x - 1\\right)}[\/latex]<\/p>\n<p>&nbsp;<\/p>\n<p>Another method to use to solve for [latex]A[\/latex] or [latex]B[\/latex] is by considering the equation that resulted from eliminating the fractions and substituting a value for [latex]x[\/latex] that will make either the [latex]A-[\/latex]\u00a0or [latex]B-[\/latex]term equal 0. If we let [latex]x=1[\/latex], the\u00a0[latex]A-[\/latex] term becomes 0 and we can simply solve for [latex]B[\/latex].<\/p>\n<p style=\"text-align: center;\">[latex]\\begin{align}3x&=A\\left(x - 1\\right)+B\\left(x+2\\right) \\\\ 3\\left(1\\right)&=A\\left[\\left(1\\right)-1\\right]+B\\left[\\left(1\\right)+2\\right] \\\\ 3&=0+3B\\hfill \\\\ B&=1 \\end{align}[\/latex]<\/p>\n<p>Next, either substitute [latex]B=1[\/latex] into the equation and solve for [latex]A[\/latex], or make the [latex]B-[\/latex]term 0 by substituting [latex]x=-2[\/latex] into the equation.<\/p>\n<p style=\"text-align: center;\">[latex]\\begin{align}3x&=A\\left(x - 1\\right)+B\\left(x+2\\right) \\\\ 3\\left(-2\\right)&=A\\left[\\left(-2\\right)-1\\right]+B\\left[\\left(-2\\right)+2\\right] \\\\ -6&=-3A+0 \\\\ \\frac{-6}{-3}&=A \\\\ A&=2 \\end{align}[\/latex]<\/p>\n<p>We obtain the same values for [latex]A[\/latex] and [latex]B[\/latex] using either method, so the decompositions are the same using either method.<\/p>\n<p style=\"text-align: center;\">[latex]\\dfrac{3x}{\\left(x+2\\right)\\left(x - 1\\right)}=\\dfrac{2}{\\left(x+2\\right)}+\\dfrac{1}{\\left(x - 1\\right)}[\/latex]<\/p>\n<p>Although this method is not seen very often in textbooks, we present it here as an alternative that may make some partial fraction decompositions easier. It is known as the <strong>Heaviside method<\/strong>, named after Charles Heaviside, a pioneer in the study of electronics.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"textbox key-takeaways\">\n<h3>Try It<\/h3>\n<p>Find the partial fraction decomposition of the following expression.<\/p>\n<p style=\"text-align: center;\">[latex]\\dfrac{x}{\\left(x - 3\\right)\\left(x - 2\\right)}[\/latex]<\/p>\n<div class=\"qa-wrapper\" style=\"display: block\"><span class=\"show-answer collapsed\" style=\"cursor: pointer\" data-target=\"q800291\">Show Solution<\/span><\/p>\n<div id=\"q800291\" class=\"hidden-answer\" style=\"display: none\">\n<p>[latex]\\dfrac{3}{x - 3}-\\dfrac{2}{x - 2}[\/latex]<\/p>\n<\/div>\n<\/div>\n<p><iframe loading=\"lazy\" id=\"mom1\" class=\"resizable\" src=\"https:\/\/ohm.lumenlearning.com\/multiembedq.php?id=18135&amp;theme=oea&amp;iframe_resize_id=mom1\" width=\"100%\" height=\"300\"><\/iframe><\/p>\n<\/div>\n<p>In this video, you will see another example of how to find a partial fraction decomposition when you have linear factors.<\/p>\n<p><iframe loading=\"lazy\" id=\"oembed-1\" title=\"Ex 1: Partial Fraction Decomposition (Linear Factors)\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/WoVdOcuSI0I?feature=oembed&#38;rel=0\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\n<h2>Decomposing P(x)\/ Q(x), Where Q(x) Has Repeated Linear Factors<\/h2>\n<p>Some fractions we may come across are special cases that we can decompose into partial fractions with repeated linear factors. We must remember that we account for repeated factors by writing each factor in increasing powers.<\/p>\n<div class=\"textbox\">\n<h3>A General Note: Partial Fraction Decomposition of [latex]\\frac{P\\left(x\\right)}{Q\\left(x\\right)}:Q\\left(x\\right)[\/latex] Has Repeated Linear Factors<\/h3>\n<p>The partial fraction decomposition of [latex]\\dfrac{P\\left(x\\right)}{Q\\left(x\\right)}[\/latex], when [latex]Q\\left(x\\right)[\/latex] has a repeated linear factor occurring [latex]n[\/latex] times and the degree of [latex]P\\left(x\\right)[\/latex] is less than the degree of [latex]Q\\left(x\\right)[\/latex], is<\/p>\n<p style=\"text-align: center;\">[latex]\\dfrac{P\\left(x\\right)}{Q\\left(x\\right)}=\\dfrac{{A}_{1}}{\\left(ax+b\\right)}+\\dfrac{{A}_{2}}{{\\left(ax+b\\right)}^{2}}+\\dfrac{{A}_{3}}{{\\left(ax+b\\right)}^{3}}+\\cdot \\cdot \\cdot +\\dfrac{{A}_{n}}{{\\left(ax+b\\right)}^{n}}[\/latex]<\/p>\n<p>Write the denominator powers in increasing order.<\/p>\n<\/div>\n<div class=\"textbox\">\n<h3>How To: Given a rational expression with repeated linear factors, decompose it.<\/h3>\n<ol>\n<li>Use a variable like [latex]A,B[\/latex], or [latex]C[\/latex] for the numerators and account for increasing powers of the denominators.\n<div style=\"text-align: center;\">[latex]\\dfrac{P\\left(x\\right)}{Q\\left(x\\right)}=\\dfrac{{A}_{1}}{\\left(ax+b\\right)}+\\dfrac{{A}_{2}}{{\\left(ax+b\\right)}^{2}}+ \\text{. }\\text{. }\\text{. + }\\dfrac{{A}_{n}}{{\\left(ax+b\\right)}^{n}}[\/latex]<\/div>\n<\/li>\n<li>Multiply both sides of the equation by the common denominator to eliminate fractions.<\/li>\n<li>Expand the right side of the equation and collect like terms.<\/li>\n<li>Set coefficients of like terms from the left side of the equation equal to those on the right side to create a system of equations to solve for the numerators.<\/li>\n<\/ol>\n<\/div>\n<div class=\"textbox exercises\">\n<h3>Example: Decomposing with Repeated Linear Factors<\/h3>\n<p>Decompose the given rational expression with repeated linear factors.<\/p>\n<p style=\"text-align: center;\">[latex]\\dfrac{-{x}^{2}+2x+4}{{x}^{3}-4{x}^{2}+4x}[\/latex]<\/p>\n<div class=\"qa-wrapper\" style=\"display: block\"><span class=\"show-answer collapsed\" style=\"cursor: pointer\" data-target=\"q969334\">Show Solution<\/span><\/p>\n<div id=\"q969334\" class=\"hidden-answer\" style=\"display: none\">\n<p>The denominator factors are [latex]x{\\left(x - 2\\right)}^{2}[\/latex]. To allow for the repeated factor of [latex]\\left(x - 2\\right)[\/latex], the decomposition will include three denominators: [latex]x,\\left(x - 2\\right)[\/latex], and [latex]{\\left(x - 2\\right)}^{2}[\/latex]. Thus,<\/p>\n<p style=\"text-align: center;\">[latex]\\dfrac{-{x}^{2}+2x+4}{{x}^{3}-4{x}^{2}+4x}=\\dfrac{A}{x}+\\dfrac{B}{\\left(x - 2\\right)}+\\dfrac{C}{{\\left(x - 2\\right)}^{2}}[\/latex]<\/p>\n<p>Next, we multiply both sides by the common denominator.<\/p>\n<p style=\"text-align: center;\">[latex]\\begin{gathered}x{\\left(x - 2\\right)}^{2}\\left[\\dfrac{-{x}^{2}+2x+4}{x{\\left(x - 2\\right)}^{2}}\\right]=\\left[\\dfrac{A}{x}+\\dfrac{B}{\\left(x - 2\\right)}+\\dfrac{C}{{\\left(x - 2\\right)}^{2}}\\right]x{\\left(x - 2\\right)}^{2} \\\\[2mm] -{x}^{2}+2x+4=A{\\left(x - 2\\right)}^{2}+Bx\\left(x - 2\\right)+Cx \\end{gathered}[\/latex]<\/p>\n<p>On the right side of the equation, we expand and collect like terms.<\/p>\n<p style=\"text-align: center;\">[latex]-{x}^{2}+2x+4=A\\left({x}^{2}-4x+4\\right)+B\\left({x}^{2}-2x\\right)+Cx[\/latex]<br \/>\n[latex]\\begin{align}&=A{x}^{2}-4Ax+4A+B{x}^{2}-2Bx+Cx \\\\ &=\\left(A+B\\right){x}^{2}+\\left(-4A - 2B+C\\right)x+4A \\end{align}[\/latex]<\/p>\n<p>Next we compare the coefficients of both sides. This will give the system of equations in three variables:<\/p>\n<p style=\"text-align: center;\">[latex]-{x}^{2}+2x+4=\\left(A+B\\right){x}^{2}+\\left(-4A - 2B+C\\right)x+4A[\/latex]<\/p>\n<p style=\"text-align: center;\">[latex]\\begin{align} A+B&=-1&& \\text{(1)}\\\\ -4A - 2B+C&=2 && \\text{(2)}\\\\ 4A&=4 && \\text{(3)}\\end{align}[\/latex]<\/p>\n<p>Solving for [latex]A[\/latex] , we have<\/p>\n<p style=\"text-align: center;\">[latex]\\begin{align}4A&=4 \\\\ A&=1 \\end{align}[\/latex]<\/p>\n<p>Substitute [latex]A=1[\/latex] into equation (1).<\/p>\n<p style=\"text-align: center;\">[latex]\\begin{align}A+B=-1 \\\\ \\left(1\\right)+B=-1 \\\\ B=-2 \\end{align}[\/latex]<\/p>\n<p>Then, to solve for [latex]C[\/latex], substitute the values for [latex]A[\/latex] and [latex]B[\/latex] into equation (2).<\/p>\n<p style=\"text-align: center;\">[latex]\\begin{align}-4A - 2B+C=2\\\\ -4\\left(1\\right)-2\\left(-2\\right)+C=2\\\\ -4+4+C=2\\\\ C=2\\end{align}[\/latex]<\/p>\n<p>Thus,<\/p>\n<p style=\"text-align: center;\">[latex]\\dfrac{-{x}^{2}+2x+4}{{x}^{3}-4{x}^{2}+4x}=\\dfrac{1}{x}-\\dfrac{2}{\\left(x - 2\\right)}+\\dfrac{2}{{\\left(x - 2\\right)}^{2}}[\/latex]<\/p>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"textbox key-takeaways\">\n<h3>Try It<\/h3>\n<p>Find the partial fraction decomposition of the expression with repeated linear factors.<\/p>\n<p style=\"text-align: center;\">[latex]\\dfrac{6x - 11}{{\\left(x - 1\\right)}^{2}}[\/latex]<\/p>\n<div class=\"qa-wrapper\" style=\"display: block\"><span class=\"show-answer collapsed\" style=\"cursor: pointer\" data-target=\"q623632\">Show Solution<\/span><\/p>\n<div id=\"q623632\" class=\"hidden-answer\" style=\"display: none\">\n<p>[latex]\\dfrac{6}{x - 1}-\\dfrac{5}{{\\left(x - 1\\right)}^{2}}[\/latex]<\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>In this video, you will see an example of how to find the partial fraction decomposition of a rational expression with repeated linear factors.<\/p>\n<p><iframe loading=\"lazy\" id=\"oembed-2\" title=\"Ex 3: Partial Fraction Decomposition (Repeated Linear Factors)\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/6DdwGw_5dvk?feature=oembed&#38;rel=0\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\n<h2>Quadratic Factors<\/h2>\n<p>So far we have performed partial fraction decomposition with expressions that have had linear factors in the denominator, and we applied numerators [latex]A,B[\/latex], or [latex]C[\/latex] representing constants. Now we will look at an example where one of the factors in the denominator is a <strong><span class=\"no-emphasis\">quadratic<\/span><\/strong> expression that does not factor. This is referred to as an irreducible quadratic factor. In cases like this, we use a linear numerator such as [latex]Ax+B,Bx+C[\/latex], etc.<\/p>\n<div class=\"textbox\">\n<h3>A General Note: Decomposition of [latex]\\frac{P\\left(x\\right)}{Q\\left(x\\right)}:Q\\left(x\\right)[\/latex] Has a Nonrepeated Irreducible Quadratic Factor<\/h3>\n<p>The partial fraction decomposition of [latex]\\dfrac{P\\left(x\\right)}{Q\\left(x\\right)}[\/latex] such that [latex]Q\\left(x\\right)[\/latex] has a nonrepeated irreducible quadratic factor and the degree of [latex]P\\left(x\\right)[\/latex] is less than the degree of [latex]Q\\left(x\\right)[\/latex] is written as<\/p>\n<p style=\"text-align: center;\">[latex]\\dfrac{P\\left(x\\right)}{Q\\left(x\\right)}=\\dfrac{{A}_{1}x+{B}_{1}}{\\left({a}_{1}{x}^{2}+{b}_{1}x+{c}_{1}\\right)}+\\dfrac{{A}_{2}x+{B}_{2}}{\\left({a}_{2}{x}^{2}+{b}_{2}x+{c}_{2}\\right)}+\\cdot \\cdot \\cdot +\\dfrac{{A}_{n}x+{B}_{n}}{\\left({a}_{n}{x}^{2}+{b}_{n}x+{c}_{n}\\right)}[\/latex]<\/p>\n<p>The decomposition may contain more rational expressions if there are linear factors. Each linear factor will have a different constant numerator: [latex]A,B,C[\/latex], and so on.<\/p>\n<\/div>\n<div class=\"textbox\">\n<h3>How To: Given a rational expression where the factors of the denominator are distinct, irreducible quadratic factors, decompose it.<\/h3>\n<ol>\n<li>Use variables such as [latex]A,B[\/latex], or [latex]C[\/latex] for the constant numerators over linear factors, and linear expressions such as [latex]{A}_{1}x+{B}_{1},{A}_{2}x+{B}_{2}[\/latex], etc., for the numerators of each quadratic factor in the denominator.\n<div style=\"text-align: center;\">[latex]\\dfrac{P\\left(x\\right)}{Q\\left(x\\right)}=\\dfrac{A}{ax+b}+\\dfrac{{A}_{1}x+{B}_{1}}{\\left({a}_{1}{x}^{2}+{b}_{1}x+{c}_{1}\\right)}+\\dfrac{{A}_{2}x+{B}_{2}}{\\left({a}_{2}{x}^{2}+{b}_{2}x+{c}_{2}\\right)}+\\cdot \\cdot \\cdot +\\dfrac{{A}_{n}x+{B}_{n}}{\\left({a}_{n}{x}^{2}+{b}_{n}x+{c}_{n}\\right)}[\/latex]<\/div>\n<\/li>\n<li>Multiply both sides of the equation by the common denominator to eliminate fractions.<\/li>\n<li>Expand the right side of the equation and collect like terms.<\/li>\n<li>Set coefficients of like terms from the left side of the equation equal to those on the right side to create a system of equations to solve for the numerators.<\/li>\n<\/ol>\n<\/div>\n<div class=\"textbox exercises\">\n<h3>Example: Decomposing [latex]\\frac{P\\left(x\\right)}{Q\\left(x\\right)}[\/latex] When <em>Q(x)<\/em> Contains a Nonrepeated Irreducible Quadratic Factor<\/h3>\n<p>Find a partial fraction decomposition of the given expression.<\/p>\n<p style=\"text-align: center;\">[latex]\\dfrac{8{x}^{2}+12x - 20}{\\left(x+3\\right)\\left({x}^{2}+x+2\\right)}[\/latex]<\/p>\n<div class=\"qa-wrapper\" style=\"display: block\"><span class=\"show-answer collapsed\" style=\"cursor: pointer\" data-target=\"q785023\">Show Solution<\/span><\/p>\n<div id=\"q785023\" class=\"hidden-answer\" style=\"display: none\">\n<p>We have one linear factor and one irreducible quadratic factor in the denominator, so one numerator will be a constant and the other numerator will be a linear expression. Thus,<\/p>\n<p style=\"text-align: center;\">[latex]\\dfrac{8{x}^{2}+12x - 20}{\\left(x+3\\right)\\left({x}^{2}+x+2\\right)}=\\dfrac{A}{\\left(x+3\\right)}+\\dfrac{Bx+C}{\\left({x}^{2}+x+2\\right)}[\/latex]<\/p>\n<p>We follow the same steps as in previous problems. First, clear the fractions by multiplying both sides of the equation by the common denominator.<\/p>\n<p style=\"text-align: center;\">[latex]\\begin{align}\\left(x+3\\right)\\left({x}^{2}+x+2\\right)\\left[\\frac{8{x}^{2}+12x - 20}{\\left(x+3\\right)\\left({x}^{2}+x+2\\right)}\\right]&=\\left[\\frac{A}{\\left(x+3\\right)}+\\frac{Bx+C}{\\left({x}^{2}+x+2\\right)}\\right]\\left(x+3\\right)\\left({x}^{2}+x+2\\right) \\\\[2mm] 8{x}^{2}+12x - 20&=A\\left({x}^{2}+x+2\\right)+\\left(Bx+C\\right)\\left(x+3\\right) \\end{align}[\/latex]<\/p>\n<p>Notice we could easily solve for [latex]A[\/latex] by choosing a value for [latex]x[\/latex] that will make the [latex]Bx+C[\/latex] term equal 0. Let [latex]x=-3[\/latex] and substitute it into the equation.<\/p>\n<p style=\"text-align: center;\">[latex]\\begin{align}8{x}^{2}+12x - 20&=A\\left({x}^{2}+x+2\\right)+\\left(Bx+C\\right)\\left(x+3\\right) \\\\ 8{\\left(-3\\right)}^{2}+12\\left(-3\\right)-20&=A\\left({\\left(-3\\right)}^{2}+\\left(-3\\right)+2\\right)+\\left(B\\left(-3\\right)+C\\right)\\left(\\left(-3\\right)+3\\right) \\\\ 16&=8A \\\\ A&=2 \\end{align}[\/latex]<\/p>\n<p>Now that we know the value of [latex]A[\/latex], substitute it back into the equation. Then expand the right side and collect like terms.<\/p>\n<p style=\"text-align: center;\">[latex]\\begin{align} &8{x}^{2}+12x - 20=2\\left({x}^{2}+x+2\\right)+\\left(Bx+C\\right)\\left(x+3\\right) \\\\ &8{x}^{2}+12x - 20=2{x}^{2}+2x+4+B{x}^{2}+3B+Cx+3C \\\\ &8{x}^{2}+12x - 20=\\left(2+B\\right){x}^{2}+\\left(2+3B+C\\right)x+\\left(4+3C\\right) \\end{align}[\/latex]<\/p>\n<p>Setting the coefficients of terms on the right side equal to the coefficients of terms on the left side gives the system of equations.<\/p>\n<p style=\"text-align: center;\">[latex]\\begin{align}2+B=8 && \\text{(1)} \\\\ 2+3B+C=12 && \\text{(2)} \\\\ 4+3C=-20 && \\text{(3)} \\end{align}[\/latex]<\/p>\n<p>Solve for [latex]B[\/latex] using equation (1) and solve for [latex]C[\/latex] using equation (3).<\/p>\n<p style=\"text-align: center;\">[latex]\\begin{align}2+B=8 && \\text{(1)} \\\\ B=6 \\\\ \\\\ 4+3C=-20 && \\text{(3)} \\\\ 3C=-24 \\\\ C=-8 \\end{align}[\/latex]<\/p>\n<p>Thus, the partial fraction decomposition of the expression is<\/p>\n<p style=\"text-align: center;\">[latex]\\dfrac{8{x}^{2}+12x - 20}{\\left(x+3\\right)\\left({x}^{2}+x+2\\right)}=\\dfrac{2}{\\left(x+3\\right)}+\\dfrac{6x - 8}{\\left({x}^{2}+x+2\\right)}[\/latex]<\/p>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"textbox\">\n<h3>Q &amp; A<\/h3>\n<h4>Could we have just set up a system of equations to solve Example 3?<\/h4>\n<p><em>Yes, we could have solved it by setting up a system of equations without solving for [latex]A[\/latex] first. The expansion on the right would be:<\/em><\/p>\n<p style=\"text-align: center;\">[latex]\\begin{align} 8{x}^{2}+12x - 20&=A{x}^{2}+Ax+2A+B{x}^{2}+3B+Cx+3C \\\\ 8{x}^{2}+12x - 20&=\\left(A+B\\right){x}^{2}+\\left(A+3B+C\\right)x+\\left(2A+3C\\right) \\end{align}[\/latex]<\/p>\n<p><em>So the system of equations would be:<\/em><\/p>\n<p style=\"text-align: center;\">[latex]\\begin{align}A+B=8 \\\\ A+3B+C=12 \\\\ 2A+3C=-20 \\end{align}[\/latex]<\/p>\n<\/div>\n<div class=\"textbox key-takeaways\">\n<h3>Try It<\/h3>\n<p>Find the partial fraction decomposition of the expression with a nonrepeating irreducible quadratic factor.<\/p>\n<p style=\"text-align: center;\">[latex]\\dfrac{5{x}^{2}-6x+7}{\\left(x - 1\\right)\\left({x}^{2}+1\\right)}[\/latex]<\/p>\n<div class=\"qa-wrapper\" style=\"display: block\"><span class=\"show-answer collapsed\" style=\"cursor: pointer\" data-target=\"q163296\">Show Solution<\/span><\/p>\n<div id=\"q163296\" class=\"hidden-answer\" style=\"display: none\">\n<p>[latex]\\dfrac{3}{x - 1}+\\dfrac{2x - 4}{{x}^{2}+1}[\/latex]<\/p>\n<\/div>\n<\/div>\n<p><iframe loading=\"lazy\" id=\"mom1\" class=\"resizable\" src=\"https:\/\/ohm.lumenlearning.com\/multiembedq.php?id=18139&amp;theme=oea&amp;iframe_resize_id=mom1\" width=\"100%\" height=\"300\"><\/iframe><\/p>\n<\/div>\n<p>In the following video, you will see another example of how to find the partial fraction decomposition for a rational expression that has quadratic factors.<\/p>\n<p><iframe loading=\"lazy\" id=\"oembed-3\" title=\"Ex 5: Partial Fraction Decomposition (Linear and Quadratic Factors)\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/prtx4o1wbaQ?feature=oembed&#38;rel=0\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\n<h2>Decomposing P(x) \/ Q(x), When Q(x) Has a Repeated Irreducible Quadratic Factor<\/h2>\n<p>Now that we can decompose a simplified <strong>rational expression<\/strong> with an irreducible <strong>quadratic<\/strong> factor, we will learn how to do partial fraction decomposition when the simplified rational expression has repeated irreducible quadratic factors. The decomposition will consist of partial fractions with linear numerators over each irreducible quadratic factor represented in increasing powers.<\/p>\n<div class=\"textbox\">\n<h3>A General Note: Decomposition of [latex]\\frac{P\\left(x\\right)}{Q\\left(x\\right)}[\/latex] When <em>Q(x)<\/em> Has a Repeated Irreducible Quadratic Factor<\/h3>\n<p>The partial fraction decomposition of [latex]\\dfrac{P\\left(x\\right)}{Q\\left(x\\right)}[\/latex], when [latex]Q\\left(x\\right)[\/latex] has a repeated irreducible quadratic factor and the degree of [latex]P\\left(x\\right)[\/latex] is less than the degree of [latex]Q\\left(x\\right)[\/latex], is<\/p>\n<p style=\"text-align: center;\">[latex]\\dfrac{P\\left(x\\right)}{{\\left(a{x}^{2}+bx+c\\right)}^{n}}=\\dfrac{{A}_{1}x+{B}_{1}}{\\left(a{x}^{2}+bx+c\\right)}+\\dfrac{{A}_{2}x+{B}_{2}}{{\\left(a{x}^{2}+bx+c\\right)}^{2}}+\\dfrac{{A}_{3}x+{B}_{3}}{{\\left(a{x}^{2}+bx+c\\right)}^{3}}+\\cdot \\cdot \\cdot +\\dfrac{{A}_{n}x+{B}_{n}}{{\\left(a{x}^{2}+bx+c\\right)}^{n}}[\/latex]<\/p>\n<p>Write the denominators in increasing powers.<\/p>\n<\/div>\n<div class=\"textbox\">\n<h3>How To: Given a rational expression that has a repeated irreducible factor, decompose it.<\/h3>\n<ol>\n<li>Use variables like [latex]A,B[\/latex], or [latex]C[\/latex] for the constant numerators over linear factors, and linear expressions such as [latex]{A}_{1}x+{B}_{1},{A}_{2}x+{B}_{2}[\/latex], etc., for the numerators of each quadratic factor in the denominator written in increasing powers, such as\n<div style=\"text-align: center;\">[latex]\\dfrac{P\\left(x\\right)}{Q\\left(x\\right)}=\\dfrac{A}{ax+b}+\\dfrac{{A}_{1}x+{B}_{1}}{\\left(a{x}^{2}+bx+c\\right)}+\\dfrac{{A}_{2}x+{B}_{2}}{{\\left(a{x}^{2}+bx+c\\right)}^{2}}+\\cdots +\\text{ }\\dfrac{{A}_{n}+{B}_{n}}{{\\left(a{x}^{2}+bx+c\\right)}^{n}}[\/latex]<\/div>\n<\/li>\n<li>Multiply both sides of the equation by the common denominator to eliminate fractions.<\/li>\n<li>Expand the right side of the equation and collect like terms.<\/li>\n<li>Set coefficients of like terms from the left side of the equation equal to those on the right side to create a system of equations to solve for the numerators.<\/li>\n<\/ol>\n<\/div>\n<div class=\"textbox exercises\">\n<h3>Example: Decomposing a Rational Function with a Repeated Irreducible Quadratic Factor in the Denominator<\/h3>\n<p>Decompose the given expression that has a repeated irreducible factor in the denominator.<\/p>\n<p style=\"text-align: center;\">[latex]\\dfrac{{x}^{4}+{x}^{3}+{x}^{2}-x+1}{x{\\left({x}^{2}+1\\right)}^{2}}[\/latex]<\/p>\n<div class=\"qa-wrapper\" style=\"display: block\"><span class=\"show-answer collapsed\" style=\"cursor: pointer\" data-target=\"q901003\">Show Solution<\/span><\/p>\n<div id=\"q901003\" class=\"hidden-answer\" style=\"display: none\">\n<p>The factors of the denominator are [latex]x,\\left({x}^{2}+1\\right)[\/latex], and [latex]{\\left({x}^{2}+1\\right)}^{2}[\/latex]. Recall that, when a factor in the denominator is a quadratic that includes at least two terms, the numerator must be of the linear form [latex]Ax+B[\/latex]. So, let\u2019s begin the decomposition.<\/p>\n<p style=\"text-align: center;\">[latex]\\dfrac{{x}^{4}+{x}^{3}+{x}^{2}-x+1}{x{\\left({x}^{2}+1\\right)}^{2}}=\\dfrac{A}{x}+\\dfrac{Bx+C}{\\left({x}^{2}+1\\right)}+\\dfrac{Dx+E}{{\\left({x}^{2}+1\\right)}^{2}}[\/latex]<\/p>\n<p>We eliminate the denominators by multiplying each term by [latex]x{\\left({x}^{2}+1\\right)}^{2}[\/latex]. Thus,<\/p>\n<p style=\"text-align: center;\">[latex]{x}^{4}+{x}^{3}+{x}^{2}-x+1=A{\\left({x}^{2}+1\\right)}^{2}+\\left(Bx+C\\right)\\left(x\\right)\\left({x}^{2}+1\\right)+\\left(Dx+E\\right)\\left(x\\right)[\/latex]<\/p>\n<p>Expand the right side.<\/p>\n<p style=\"text-align: center;\">[latex]\\begin{align}&{x}^{4}+{x}^{3}+{x}^{2}-x+1=A\\left({x}^{4}+2{x}^{2}+1\\right)+B{x}^{4}+B{x}^{2}+C{x}^{3}+Cx+D{x}^{2}+Ex \\\\ &=A{x}^{4}+2A{x}^{2}+A+B{x}^{4}+B{x}^{2}+C{x}^{3}+Cx+D{x}^{2}+Ex \\end{align}[\/latex]<\/p>\n<p>Now we will collect like terms.<\/p>\n<p style=\"text-align: center;\">[latex]{x}^{4}+{x}^{3}+{x}^{2}-x+1=\\left(A+B\\right){x}^{4}+\\left(C\\right){x}^{3}+\\left(2A+B+D\\right){x}^{2}+\\left(C+E\\right)x+A[\/latex]<\/p>\n<p>Set up the system of equations matching corresponding coefficients on each side of the equal sign.<\/p>\n<p style=\"text-align: center;\">[latex]\\begin{align}A+B=1 \\\\ C=1 \\\\ \\\\ 2A+B+D=1 \\\\ C+E=-1 \\\\ A=1 \\end{align}[\/latex]<\/p>\n<p>We can use substitution from this point. Substitute [latex]A=1[\/latex] into the first equation.<\/p>\n<p style=\"text-align: center;\">[latex]\\begin{align}1+B=1 \\\\ B=0 \\end{align}[\/latex]<\/p>\n<p>Substitute [latex]A=1[\/latex] and [latex]B=0[\/latex] into the third equation.<\/p>\n<p style=\"text-align: center;\">[latex]\\begin{align}2\\left(1\\right)+0+D=1 \\\\ D=-1 \\end{align}[\/latex]<\/p>\n<p>Substitute [latex]C=1[\/latex] into the fourth equation.<\/p>\n<p style=\"text-align: center;\">[latex]\\begin{align} 1+E=-1\\\\ E=-2\\end{align}[\/latex]<\/p>\n<p>Now we have solved for all of the unknowns on the right side of the equal sign. We have [latex]A=1[\/latex], [latex]B=0[\/latex], [latex]C=1[\/latex], [latex]D=-1[\/latex], and [latex]E=-2[\/latex]. We can write the decomposition as follows:<\/p>\n<p style=\"text-align: center;\">[latex]\\dfrac{{x}^{4}+{x}^{3}+{x}^{2}-x+1}{x{\\left({x}^{2}+1\\right)}^{2}}=\\dfrac{1}{x}+\\dfrac{1}{\\left({x}^{2}+1\\right)}-\\dfrac{x+2}{{\\left({x}^{2}+1\\right)}^{2}}[\/latex]<\/p>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"textbox key-takeaways\">\n<h3>Try It<\/h3>\n<p>Find the partial fraction decomposition of the expression with a repeated irreducible quadratic factor.<\/p>\n<p style=\"text-align: center;\">[latex]\\dfrac{{x}^{3}-4{x}^{2}+9x - 5}{{\\left({x}^{2}-2x+3\\right)}^{2}}[\/latex]<\/p>\n<div class=\"qa-wrapper\" style=\"display: block\"><span class=\"show-answer collapsed\" style=\"cursor: pointer\" data-target=\"q741991\">Show Solution<\/span><\/p>\n<div id=\"q741991\" class=\"hidden-answer\" style=\"display: none\">\n<p>[latex]\\dfrac{x - 2}{{x}^{2}-2x+3}+\\dfrac{2x+1}{{\\left({x}^{2}-2x+3\\right)}^{2}}[\/latex]<\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>This video provides you with another worked example of how to find the partial fraction decomposition for a rational expression that has repeating quadratic factors.<\/p>\n<p><iframe loading=\"lazy\" id=\"oembed-4\" title=\"Ex 6: Partial Fraction Decomposition (Repeating Quadratic Factors)\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/Dupeou-FDnI?feature=oembed&#38;rel=0\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\n<h2>Key Concepts<\/h2>\n<ul>\n<li>Decompose [latex]\\frac{P\\left(x\\right)}{Q\\left(x\\right)}[\/latex] by writing the partial fractions as [latex]\\frac{A}{{a}_{1}x+{b}_{1}}+\\frac{B}{{a}_{2}x+{b}_{2}}[\/latex]. Solve by clearing the fractions, expanding the right side, collecting like terms, and setting corresponding coefficients equal to each other, then setting up and solving a system of equations.<\/li>\n<li>The decomposition of [latex]\\frac{P\\left(x\\right)}{Q\\left(x\\right)}[\/latex] with repeated linear factors must account for the factors of the denominator in increasing powers.<\/li>\n<li>The decomposition of [latex]\\frac{P\\left(x\\right)}{Q\\left(x\\right)}[\/latex] with a nonrepeated irreducible quadratic factor needs a linear numerator over the quadratic factor, as in [latex]\\frac{A}{x}+\\frac{Bx+C}{\\left(a{x}^{2}+bx+c\\right)}[\/latex].<\/li>\n<li>In the decomposition of [latex]\\frac{P\\left(x\\right)}{Q\\left(x\\right)}[\/latex], where [latex]Q\\left(x\\right)[\/latex] has a repeated irreducible quadratic factor, when the irreducible quadratic factors are repeated, powers of the denominator factors must be represented in increasing powers as\n<p style=\"text-align: center;\">[latex]\\frac{Ax+B}{\\left(a{x}^{2}+bx+c\\right)}+\\frac{{A}_{2}x+{B}_{2}}{{\\left(a{x}^{2}+bx+c\\right)}^{2}}+\\cdots \\text{+}\\frac{{A}_{n}x+{B}_{n}}{{\\left(a{x}^{2}+bx+c\\right)}^{n}}[\/latex].<\/p>\n<\/li>\n<\/ul>\n<h2>Glossary<\/h2>\n<p><strong>partial fractions<\/strong> the individual fractions that make up the sum or difference of a rational expression before combining them into a simplified rational expression<\/p>\n<p><strong>partial fraction decomposition<\/strong> the process of returning a simplified rational expression to its original form, a sum or difference of simpler rational expressions<\/p>\n\n\t\t\t <section class=\"citations-section\" role=\"contentinfo\">\n\t\t\t <h3>Candela Citations<\/h3>\n\t\t\t\t\t <div>\n\t\t\t\t\t\t <div id=\"citation-list-1878\">\n\t\t\t\t\t\t\t <div class=\"licensing\"><div class=\"license-attribution-dropdown-subheading\">CC licensed content, Original<\/div><ul class=\"citation-list\"><li>Revision and Adaptation. <strong>Provided by<\/strong>: Lumen Learning. <strong>License<\/strong>: <em><a target=\"_blank\" rel=\"license\" href=\"https:\/\/creativecommons.org\/licenses\/by\/4.0\/\">CC BY: Attribution<\/a><\/em><\/li><\/ul><div class=\"license-attribution-dropdown-subheading\">CC licensed content, Shared previously<\/div><ul class=\"citation-list\"><li>College Algebra. <strong>Authored by<\/strong>: Abramson, Jay et al.. <strong>Provided by<\/strong>: OpenStax. <strong>Located at<\/strong>: <a target=\"_blank\" href=\"http:\/\/cnx.org\/contents\/9b08c294-057f-4201-9f48-5d6ad992740d@5.2\">http:\/\/cnx.org\/contents\/9b08c294-057f-4201-9f48-5d6ad992740d@5.2<\/a>. <strong>License<\/strong>: <em><a target=\"_blank\" rel=\"license\" href=\"https:\/\/creativecommons.org\/licenses\/by\/4.0\/\">CC BY: Attribution<\/a><\/em>. <strong>License Terms<\/strong>: Download for free at http:\/\/cnx.org\/contents\/9b08c294-057f-4201-9f48-5d6ad992740d@5.2<\/li><li>Ex 1: Partial Fraction Decomposition (Linear Factors). <strong>Authored by<\/strong>: James Sousa (Mathispower4u.com). <strong>Located at<\/strong>: <a target=\"_blank\" href=\"https:\/\/youtu.be\/WoVdOcuSI0I\">https:\/\/youtu.be\/WoVdOcuSI0I<\/a>. <strong>License<\/strong>: <em><a target=\"_blank\" rel=\"license\" href=\"https:\/\/creativecommons.org\/licenses\/by\/4.0\/\">CC BY: Attribution<\/a><\/em><\/li><li>Ex 3: Partial Fraction Decomposition (Repeated Linear Factors). <strong>Authored by<\/strong>: James Sousa (Mathispower4u.com) . <strong>Located at<\/strong>: <a target=\"_blank\" href=\"https:\/\/youtu.be\/6DdwGw_5dvk\">https:\/\/youtu.be\/6DdwGw_5dvk<\/a>. <strong>License<\/strong>: <em><a target=\"_blank\" rel=\"license\" href=\"https:\/\/creativecommons.org\/licenses\/by\/4.0\/\">CC BY: Attribution<\/a><\/em><\/li><li>Question ID 18139. <strong>Authored by<\/strong>: Shahbazian, Roy. <strong>License<\/strong>: <em><a target=\"_blank\" rel=\"license\" href=\"https:\/\/creativecommons.org\/licenses\/by\/4.0\/\">CC BY: Attribution<\/a><\/em>. <strong>License Terms<\/strong>: IMathAS Community License CC-BY + GPL<\/li><li>Ex 5: Partial Fraction Decomposition (Linear and Quadratic Factors). <strong>Authored by<\/strong>: James Sousa (Mathispower4u.com). <strong>Located at<\/strong>: <a target=\"_blank\" href=\"https:\/\/youtu.be\/prtx4o1wbaQ\">https:\/\/youtu.be\/prtx4o1wbaQ<\/a>. <strong>License<\/strong>: <em><a target=\"_blank\" rel=\"license\" href=\"https:\/\/creativecommons.org\/licenses\/by\/4.0\/\">CC BY: Attribution<\/a><\/em><\/li><li>Ex 6: Partial Fraction Decomposition (Repeating Quadratic Factors). <strong>Authored by<\/strong>: James Sousa (Mathispower4u.com). <strong>Located at<\/strong>: <a target=\"_blank\" href=\"https:\/\/youtu.be\/Dupeou-FDnI\">https:\/\/youtu.be\/Dupeou-FDnI<\/a>. <strong>License<\/strong>: <em><a target=\"_blank\" rel=\"license\" href=\"https:\/\/creativecommons.org\/licenses\/by\/4.0\/\">CC BY: Attribution<\/a><\/em><\/li><\/ul><div class=\"license-attribution-dropdown-subheading\">CC licensed content, Specific attribution<\/div><ul class=\"citation-list\"><li>Precalculus. <strong>Authored by<\/strong>: OpenStax College. <strong>Provided by<\/strong>: OpenStax. <strong>Located at<\/strong>: <a target=\"_blank\" href=\"http:\/\/cnx.org\/contents\/fd53eae1-fa23-47c7-bb1b-972349835c3c@5.175:1\/Preface\">http:\/\/cnx.org\/contents\/fd53eae1-fa23-47c7-bb1b-972349835c3c@5.175:1\/Preface<\/a>. <strong>License<\/strong>: <em><a target=\"_blank\" rel=\"license\" href=\"https:\/\/creativecommons.org\/licenses\/by\/4.0\/\">CC BY: Attribution<\/a><\/em><\/li><\/ul><\/div>\n\t\t\t\t\t\t <\/div>\n\t\t\t\t\t <\/div>\n\t\t\t <\/section>","protected":false},"author":708740,"menu_order":3,"template":"","meta":{"_candela_citation":"[{\"type\":\"cc-attribution\",\"description\":\"Precalculus\",\"author\":\"OpenStax 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(Mathispower4u.com)\",\"organization\":\"\",\"url\":\"https:\/\/youtu.be\/WoVdOcuSI0I\",\"project\":\"\",\"license\":\"cc-by\",\"license_terms\":\"\"},{\"type\":\"cc\",\"description\":\"Ex 3: Partial Fraction Decomposition (Repeated Linear Factors)\",\"author\":\"James Sousa (Mathispower4u.com) \",\"organization\":\"\",\"url\":\"https:\/\/youtu.be\/6DdwGw_5dvk\",\"project\":\"\",\"license\":\"cc-by\",\"license_terms\":\"\"},{\"type\":\"cc\",\"description\":\"Question ID 18139\",\"author\":\"Shahbazian, Roy\",\"organization\":\"\",\"url\":\"\",\"project\":\"\",\"license\":\"cc-by\",\"license_terms\":\"IMathAS Community License CC-BY + GPL\"},{\"type\":\"cc\",\"description\":\"Ex 5: Partial Fraction Decomposition (Linear and Quadratic Factors)\",\"author\":\"James Sousa (Mathispower4u.com)\",\"organization\":\"\",\"url\":\"https:\/\/youtu.be\/prtx4o1wbaQ\",\"project\":\"\",\"license\":\"cc-by\",\"license_terms\":\"\"},{\"type\":\"cc\",\"description\":\"Ex 6: Partial Fraction Decomposition (Repeating Quadratic Factors)\",\"author\":\"James Sousa (Mathispower4u.com)\",\"organization\":\"\",\"url\":\"https:\/\/youtu.be\/Dupeou-FDnI\",\"project\":\"\",\"license\":\"cc-by\",\"license_terms\":\"\"}]","CANDELA_OUTCOMES_GUID":"","pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":[],"pb_section_license":""},"chapter-type":[],"contributor":[],"license":[],"class_list":["post-1878","chapter","type-chapter","status-publish","hentry"],"part":1875,"_links":{"self":[{"href":"https:\/\/courses.lumenlearning.com\/tulsacc-precalculus\/wp-json\/pressbooks\/v2\/chapters\/1878","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/courses.lumenlearning.com\/tulsacc-precalculus\/wp-json\/pressbooks\/v2\/chapters"}],"about":[{"href":"https:\/\/courses.lumenlearning.com\/tulsacc-precalculus\/wp-json\/wp\/v2\/types\/chapter"}],"author":[{"embeddable":true,"href":"https:\/\/courses.lumenlearning.com\/tulsacc-precalculus\/wp-json\/wp\/v2\/users\/708740"}],"version-history":[{"count":1,"href":"https:\/\/courses.lumenlearning.com\/tulsacc-precalculus\/wp-json\/pressbooks\/v2\/chapters\/1878\/revisions"}],"predecessor-version":[{"id":2221,"href":"https:\/\/courses.lumenlearning.com\/tulsacc-precalculus\/wp-json\/pressbooks\/v2\/chapters\/1878\/revisions\/2221"}],"part":[{"href":"https:\/\/courses.lumenlearning.com\/tulsacc-precalculus\/wp-json\/pressbooks\/v2\/parts\/1875"}],"metadata":[{"href":"https:\/\/courses.lumenlearning.com\/tulsacc-precalculus\/wp-json\/pressbooks\/v2\/chapters\/1878\/metadata\/"}],"wp:attachment":[{"href":"https:\/\/courses.lumenlearning.com\/tulsacc-precalculus\/wp-json\/wp\/v2\/media?parent=1878"}],"wp:term":[{"taxonomy":"chapter-type","embeddable":true,"href":"https:\/\/courses.lumenlearning.com\/tulsacc-precalculus\/wp-json\/pressbooks\/v2\/chapter-type?post=1878"},{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/courses.lumenlearning.com\/tulsacc-precalculus\/wp-json\/wp\/v2\/contributor?post=1878"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/courses.lumenlearning.com\/tulsacc-precalculus\/wp-json\/wp\/v2\/license?post=1878"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}