{"id":2362,"date":"2019-05-13T12:56:14","date_gmt":"2019-05-13T12:56:14","guid":{"rendered":"https:\/\/courses.lumenlearning.com\/suny-dutchess-precalculus\/?post_type=chapter&p=2362"},"modified":"2019-05-13T12:57:04","modified_gmt":"2019-05-13T12:57:04","slug":"2-3-section-exercises","status":"web-only","type":"chapter","link":"https:\/\/courses.lumenlearning.com\/suny-dutchess-precalculus\/chapter\/2-3-section-exercises\/","title":{"raw":"2.3 Section Exercises","rendered":"2.3 Section Exercises"},"content":{"raw":"
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2.3 Section Exercises<\/h3>\r\n
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Verbal<\/h4>\r\n
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1. What role does the horizontal asymptote of an exponential function play in telling us about the end behavior of the graph?<\/p>\r\n\r\n<\/div>\r\n

[reveal-answer q=\"fs-id1165135386464\"]Show Solution[\/reveal-answer]\r\n[hidden-answer a=\"fs-id1165135386464\"]\r\n

An asymptote is a line that the graph of a function approaches, as[latex]\\text{ }x\\text{ }[\/latex]either increases or decreases without bound. The horizontal asymptote of an exponential function tells us the limit of the function\u2019s values as the independent variable gets either extremely large or extremely small.<\/p>\r\n[\/hidden-answer]\r\n\r\n<\/div>\r\n<\/div>\r\n

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2. What is the advantage of knowing how to recognize transformations of the graph of a parent function algebraically?<\/p>\r\n\r\n<\/div>\r\n<\/div>\r\n<\/div>\r\n

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Algebraic<\/h4>\r\n
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3. The graph of[latex]\\text{ }f\\left(x\\right)={3}^{x}\\text{ }[\/latex]is reflected about the y<\/em>-axis and stretched vertically by a factor of[latex]\\text{ }4.\\text{ }[\/latex]What is the equation of the new function,[latex]\\text{ }g\\left(x\\right)?\\text{ }[\/latex]State its y<\/em>-intercept, domain, and range.<\/p>\r\n\r\n<\/div>\r\n

[reveal-answer q=\"fs-id1165135369259\"]Show Solution[\/reveal-answer]\r\n[hidden-answer a=\"fs-id1165135369259\"]\r\n

[latex]g\\left(x\\right)=4{\\left(3\\right)}^{-x};\\text{ }[\/latex]y<\/em>-intercept:[latex]\\text{ }\\left(0,4\\right);\\text{ }[\/latex]Domain: all real numbers; Range: all real numbers greater than[latex]\\text{ }0.[\/latex]<\/p>\r\n[\/hidden-answer]\r\n\r\n<\/div>\r\n<\/div>\r\n

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4. The graph of[latex]\\text{ }f\\left(x\\right)={\\left(\\frac{1}{2}\\right)}^{-x}\\text{ }[\/latex]is reflected about the y<\/em>-axis and compressed vertically by a factor of[latex]\\text{ }\\frac{1}{5}.\\text{ }[\/latex]What is the equation of the new function,[latex]\\text{ }g\\left(x\\right)?\\text{ }[\/latex]State its y<\/em>-intercept, domain, and range.<\/p>\r\n\r\n<\/div>\r\n<\/div>\r\n

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5. The graph of[latex]\\text{ }f\\left(x\\right)={10}^{x}\\text{ }[\/latex]is reflected about the x<\/em>-axis and shifted upward[latex]\\text{ }7\\text{ }[\/latex]units. What is the equation of the new function,[latex]\\text{ }g\\left(x\\right)?\\text{ }[\/latex]State its y<\/em>-intercept, domain, and range.<\/p>\r\n\r\n<\/div>\r\n

[reveal-answer q=\"fs-id1165137851416\"]Show Solution[\/reveal-answer]\r\n[hidden-answer a=\"fs-id1165137851416\"]\r\n

[latex]g\\left(x\\right)=-{10}^{x}+7;\\text{ }[\/latex]y<\/em>-intercept:[latex]\\text{ }\\left(0,6\\right);\\text{ }[\/latex]Domain: all real numbers; Range: all real numbers less than[latex]\\text{ }7.[\/latex]<\/p>\r\n[\/hidden-answer]\r\n\r\n<\/div>\r\n<\/div>\r\n

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6. The graph of[latex]\\text{ }f\\left(x\\right)={\\left(1.68\\right)}^{x}\\text{ }[\/latex]is shifted right[latex]\\text{ }3\\text{ }[\/latex]units, stretched vertically by a factor of[latex]\\text{ }2,[\/latex]reflected about the x<\/em>-axis, and then shifted downward[latex]\\text{ }3\\text{ }[\/latex]units. What is the equation of the new function,[latex]\\text{ }g\\left(x\\right)?\\text{ }[\/latex]State its y<\/em>-intercept (to the nearest thousandth), domain, and range.<\/p>\r\n\r\n<\/div>\r\n<\/div>\r\n

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7. The graph of[latex]\\text{ }f\\left(x\\right)=2{\\left(\\frac{1}{4}\\right)}^{x-20}[\/latex] is shifted left[latex]\\text{ }2\\text{ }[\/latex]units, stretched vertically by a factor of[latex]\\text{ }4,[\/latex]reflected about the x<\/em>-axis, and then shifted downward[latex]\\text{ }4\\text{ }[\/latex]units. What is the equation of the new function,[latex]\\text{ }g\\left(x\\right)?\\text{ }[\/latex]State its y<\/em>-intercept, domain, and range.<\/p>\r\n\r\n<\/div>\r\n

[reveal-answer q=\"fs-id1165137724981\"]Show Solution[\/reveal-answer]\r\n[hidden-answer a=\"fs-id1165137724981\"]\r\n

[latex]g\\left(x\\right)=2{\\left(\\frac{1}{4}\\right)}^{x};\\text{ }[\/latex] y<\/em>-intercept:[latex]\\text{ }\\left(0,\\text{ 2}\\right);\\text{ }[\/latex]Domain: all real numbers; Range: all real numbers greater than[latex]\\text{ }0.[\/latex]<\/p>\r\n[\/hidden-answer]\r\n\r\n<\/div>\r\n<\/div>\r\n<\/div>\r\n

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Graphical<\/h4>\r\nFor the following exercises, graph the function and its reflection about the y<\/em>-axis on the same axes, and give the y<\/em>-intercept.\r\n
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8. [latex]f\\left(x\\right)=3{\\left(\\frac{1}{2}\\right)}^{x}[\/latex]<\/p>\r\n\r\n<\/div>\r\n<\/div>\r\n

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9. [latex]g\\left(x\\right)=-2{\\left(0.25\\right)}^{x}[\/latex]<\/p>\r\n[reveal-answer q=\"487063\"]Show Answer[\/reveal-answer] [hidden-answer a=\"487063\"]\r\n\r\n\"Graph\u00a0y<\/em>-intercept:[latex]\\text{ }\\left(0,-2\\right)[\/latex]\r\n\r\n[\/hidden-answer]<\/span>\r\n\r\n<\/div>\r\n<\/div>\r\n

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10. [latex]h\\left(x\\right)=6{\\left(1.75\\right)}^{-x}[\/latex]<\/p>\r\n\r\n<\/div>\r\n<\/div>\r\n

For the following exercises, graph each set of functions on the same axes.<\/p>\r\n\r\n

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11. [latex]f\\left(x\\right)=3{\\left(\\frac{1}{4}\\right)}^{x},[\/latex][latex]g\\left(x\\right)=3{\\left(2\\right)}^{x},[\/latex]and[latex]\\text{ }h\\left(x\\right)=3{\\left(4\\right)}^{x}[\/latex]<\/p>\r\n\r\n<\/div>\r\n

[reveal-answer q=\"fs-id1165137639767\"]Show Solution[\/reveal-answer]\r\n[hidden-answer a=\"fs-id1165137639767\"]\"Graph<\/span>[\/hidden-answer]<\/div>\r\n<\/div>\r\n
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12. [latex]f\\left(x\\right)=\\frac{1}{4}{\\left(3\\right)}^{x},[\/latex][latex]g\\left(x\\right)=2{\\left(3\\right)}^{x},[\/latex]and[latex]\\text{ }h\\left(x\\right)=4{\\left(3\\right)}^{x}[\/latex]<\/p>\r\n\r\n<\/div>\r\n<\/div>\r\n

For the following exercises, match each function with one of the graphs in (Figure)<\/a>.<\/p>\r\n\r\n

\"Graph<\/span><\/div>\r\n
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13. [latex]f\\left(x\\right)=2{\\left(0.69\\right)}^{x}[\/latex]<\/p>\r\n\r\n<\/div>\r\n

[reveal-answer q=\"fs-id1165137722409\"]Show Solution[\/reveal-answer]\r\n[hidden-answer a=\"fs-id1165137722409\"]\r\n

B<\/p>\r\n[\/hidden-answer]\r\n\r\n<\/div>\r\n<\/div>\r\n

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14. [latex]f\\left(x\\right)=2{\\left(1.28\\right)}^{x}[\/latex]<\/p>\r\n\r\n<\/div>\r\n<\/div>\r\n

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15. [latex]f\\left(x\\right)=2{\\left(0.81\\right)}^{x}[\/latex]<\/p>\r\n\r\n<\/div>\r\n

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[reveal-answer q=\"388797\"]Show Answer[\/reveal-answer]\r\n[hidden-answer a=\"388797\"]A[\/hidden-answer]<\/p>\r\n\r\n<\/div>\r\n<\/div>\r\n

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16. [latex]f\\left(x\\right)=4{\\left(1.28\\right)}^{x}[\/latex]<\/p>\r\n\r\n<\/div>\r\n<\/div>\r\n

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17. [latex]f\\left(x\\right)=2{\\left(1.59\\right)}^{x}[\/latex]<\/p>\r\n\r\n<\/div>\r\n

[reveal-answer q=\"fs-id1165135541572\"]Show Solution[\/reveal-answer]\r\n[hidden-answer a=\"fs-id1165135541572\"]\r\n

E<\/p>\r\n[\/hidden-answer]\r\n\r\n<\/div>\r\n<\/div>\r\n

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18. [latex]f\\left(x\\right)=4{\\left(0.69\\right)}^{x}[\/latex]<\/p>\r\n\r\n<\/div>\r\n<\/div>\r\n

For the following exercises, use the graphs shown in (Figure)<\/a>. All have the form[latex]\\text{ }f\\left(x\\right)=a{b}^{x}.[\/latex]<\/p>\r\n\r\n

\"Graph<\/span><\/div>\r\n
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19. Which graph has the largest value for[latex]\\text{ }b?[\/latex]<\/p>\r\n\r\n<\/div>\r\n

[reveal-answer q=\"fs-id1165134040575\"]Show Solution[\/reveal-answer]\r\n[hidden-answer a=\"fs-id1165134040575\"]\r\n

D<\/p>\r\n[\/hidden-answer]\r\n\r\n<\/div>\r\n<\/div>\r\n

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20. Which graph has the smallest value for[latex]\\text{ }b?[\/latex]<\/p>\r\n\r\n<\/div>\r\n<\/div>\r\n

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21. Which graph has the largest value for[latex]\\text{ }a?[\/latex]<\/p>\r\n\r\n<\/div>\r\n

[reveal-answer q=\"fs-id1165137836509\"]Show Solution[\/reveal-answer]\r\n[hidden-answer a=\"fs-id1165137836509\"]\r\n

C<\/p>\r\n[\/hidden-answer]\r\n\r\n<\/div>\r\n<\/div>\r\n

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22. Which graph has the smallest value for[latex]\\text{ }a?[\/latex]<\/p>\r\n\r\n<\/div>\r\n<\/div>\r\n

For the following exercises, graph the function and its reflection about the x<\/em>-axis on the same axes.<\/p>\r\n\r\n

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23. [latex]f\\left(x\\right)=\\frac{1}{2}{\\left(4\\right)}^{x}[\/latex]<\/p>\r\n\r\n<\/div>\r\n

[reveal-answer q=\"fs-id1165135581221\"]Show Solution[\/reveal-answer]\r\n[hidden-answer a=\"fs-id1165135581221\"]\"Graph<\/span>[\/hidden-answer]<\/div>\r\n<\/div>\r\n
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24. [latex]f\\left(x\\right)=3{\\left(0.75\\right)}^{x}-1[\/latex]<\/p>\r\n\r\n<\/div>\r\n<\/div>\r\n

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25. [latex]f\\left(x\\right)=-4{\\left(2\\right)}^{x}+2[\/latex]<\/p>\r\n\r\n<\/div>\r\n

[reveal-answer q=\"fs-id1165135187279\"]Show Solution[\/reveal-answer]\r\n[hidden-answer a=\"fs-id1165135187279\"]\"Graph<\/span>[\/hidden-answer]<\/div>\r\n<\/div>\r\n

For the following exercises, graph the transformation of[latex]\\text{ }f\\left(x\\right)={2}^{x}.\\text{ }[\/latex]Give the horizontal asymptote, the domain, and the range.<\/p>\r\n\r\n

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26. [latex]f\\left(x\\right)={2}^{-x}[\/latex]<\/p>\r\n\r\n<\/div>\r\n<\/div>\r\n

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27. [latex]h\\left(x\\right)={2}^{x}+3[\/latex]<\/p>\r\n\r\n<\/div>\r\n

[reveal-answer q=\"fs-id1165137704844\"]Show Solution[\/reveal-answer]\r\n[hidden-answer a=\"fs-id1165137704844\"]\"Graph<\/span>\r\n

Horizontal asymptote:[latex]\\text{ }h\\left(x\\right)=3;[\/latex] Domain: all real numbers; Range: all real numbers strictly greater than[latex]\\text{ }3.[\/latex]<\/p>\r\n[\/hidden-answer]\r\n\r\n<\/div>\r\n<\/div>\r\n

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28. [latex]f\\left(x\\right)={2}^{x-2}[\/latex]<\/p>\r\n\r\n<\/div>\r\n<\/div>\r\n

For the following exercises, describe the end behavior of the graphs of the functions.<\/p>\r\n\r\n

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29. [latex]f\\left(x\\right)=-5{\\left(4\\right)}^{x}-1[\/latex]<\/p>\r\n\r\n<\/div>\r\n

[reveal-answer q=\"fs-id1165135160376\"]Show Solution[\/reveal-answer]\r\n[hidden-answer a=\"fs-id1165135160376\"]\r\n

As [latex]x\\to \\infty [\/latex], [latex]f\\left(x\\right)\\to -\\infty [\/latex];<\/p>\r\nAs [latex]x\\to -\\infty [\/latex], [latex]f\\left(x\\right)\\to -1[\/latex]\r\n

[\/hidden-answer]<\/div>\r\n<\/div>\r\n<\/div>\r\n
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30. [latex]f\\left(x\\right)=3{\\left(\\frac{1}{2}\\right)}^{x}-2[\/latex]<\/p>\r\n\r\n<\/div>\r\n<\/div>\r\n

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31. [latex]f\\left(x\\right)=3{\\left(4\\right)}^{-x}+2[\/latex]<\/p>\r\n\r\n<\/div>\r\n

[reveal-answer q=\"fs-id1165135543075\"]Show Solution[\/reveal-answer]\r\n[hidden-answer a=\"fs-id1165135543075\"]\r\n

As [latex]x\\to \\infty [\/latex], [latex]f\\left(x\\right)\\to 2[\/latex];<\/p>\r\nAs [latex]x\\to -\\infty [\/latex], [latex]f\\left(x\\right)\\to \\infty [\/latex]\r\n

[\/hidden-answer]<\/div>\r\n<\/div>\r\n<\/div>\r\n

For the following exercises, start with the graph of[latex]\\text{ }f\\left(x\\right)={4}^{x}.\\text{ }[\/latex]Then write a function that results from the given transformation.<\/p>\r\n\r\n

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32. Shift [latex]f\\left(x\\right)[\/latex] 4 units upward<\/p>\r\n\r\n<\/div>\r\n<\/div>\r\n

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33. Shift[latex]\\text{ }f\\left(x\\right)\\text{ }[\/latex]3 units downward<\/p>\r\n\r\n<\/div>\r\n

[reveal-answer q=\"fs-id1165137731311\"]Show Solution[\/reveal-answer]\r\n[hidden-answer a=\"fs-id1165137731311\"]\r\n

[latex]f\\left(x\\right)={4}^{x}-3[\/latex]<\/p>\r\n[\/hidden-answer]\r\n\r\n<\/div>\r\n<\/div>\r\n

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34. Shift[latex]\\text{ }f\\left(x\\right)\\text{ }[\/latex]2 units left<\/p>\r\n\r\n<\/div>\r\n<\/div>\r\n

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35. Shift[latex]\\text{ }f\\left(x\\right)\\text{ }[\/latex]5 units right<\/p>\r\n\r\n<\/div>\r\n

[reveal-answer q=\"fs-id1165137572737\"]Show Solution[\/reveal-answer]\r\n[hidden-answer a=\"fs-id1165137572737\"]\r\n

[latex]f\\left(x\\right)={4}^{x-5}[\/latex]<\/p>\r\n[\/hidden-answer]\r\n\r\n<\/div>\r\n<\/div>\r\n

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36. Reflect[latex]\\text{ }f\\left(x\\right)\\text{ }[\/latex]about the x<\/em>-axis<\/p>\r\n\r\n<\/div>\r\n<\/div>\r\n

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37. Reflect[latex]\\text{ }f\\left(x\\right)\\text{ }[\/latex]about the y<\/em>-axis<\/p>\r\n\r\n<\/div>\r\n

[reveal-answer q=\"fs-id1165135209553\"]Show Solution[\/reveal-answer]\r\n[hidden-answer a=\"fs-id1165135209553\"][latex]f\\left(x\\right)={4}^{-x}[\/latex][\/hidden-answer]<\/div>\r\n<\/div>\r\n

For the following exercises, each graph is a transformation of[latex]\\text{ }y={2}^{x}.\\text{ }[\/latex]Write an equation describing the transformation.<\/p>\r\n\r\n

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<\/div>\r\n38.\u00a0\"Graph<\/span>\r\n\r\n<\/div>\r\n<\/div>\r\n
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<\/div>\r\n39.\u00a0\"Graph<\/span>\r\n\r\n<\/div>\r\n
[reveal-answer q=\"fs-id1165135536375\"]Show Solution[\/reveal-answer]\r\n[hidden-answer a=\"fs-id1165135536375\"]\r\n

[latex]y=-{2}^{x}+3[\/latex]<\/p>\r\n[\/hidden-answer]\r\n\r\n<\/div>\r\n<\/div>\r\n

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<\/div>\r\n40.\u00a0\"Graph<\/span>\r\n\r\n<\/div>\r\n<\/div>\r\nFor the following exercises, find an exponential equation for the graph.\r\n
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<\/div>\r\n41.\u00a0\"Graph<\/span>\r\n\r\n<\/div>\r\n
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[reveal-answer q=\"312793\"]Show Answer[\/reveal-answer]\r\n[hidden-answer a=\"312793\"][latex]y=-2{\\left(3\\right)}^{x}+7[\/latex][\/hidden-answer]<\/p>\r\n\r\n<\/div>\r\n<\/div>\r\n

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<\/div>\r\n42.\u00a0\"Graph<\/span>\r\n\r\n<\/div>\r\n<\/div>\r\n<\/div>\r\n
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Numeric<\/h4>\r\n

For the following exercises, evaluate the exponential functions for the indicated value of[latex]\\text{ }x.[\/latex]<\/p>\r\n\r\n

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43. [latex]g\\left(x\\right)=\\frac{1}{3}{\\left(7\\right)}^{x-2}\\text{ }[\/latex]for[latex]\\text{ }g\\left(6\\right).[\/latex]<\/p>\r\n\r\n<\/div>\r\n

[reveal-answer q=\"fs-id1165135175180\"]Show Solution[\/reveal-answer]\r\n[hidden-answer a=\"fs-id1165135175180\"]\r\n

[latex]g\\left(6\\right)=800+\\frac{1}{3}\\approx 800.3333[\/latex]<\/p>\r\n[\/hidden-answer]\r\n\r\n<\/div>\r\n<\/div>\r\n

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44. [latex]f\\left(x\\right)=4{\\left(2\\right)}^{x-1}-2\\text{ }[\/latex]for[latex]\\text{ }f\\left(5\\right).[\/latex]<\/p>\r\n\r\n<\/div>\r\n<\/div>\r\n

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45. [latex]h\\left(x\\right)=-\\frac{1}{2}{\\left(\\frac{1}{2}\\right)}^{x}+6\\text{ }[\/latex]for[latex]\\text{ }h\\left(-7\\right).[\/latex]<\/p>\r\n\r\n<\/div>\r\n

[reveal-answer q=\"fs-id1165134044680\"]Show Solution[\/reveal-answer]\r\n[hidden-answer a=\"fs-id1165134044680\"]\r\n

[latex]h\\left(-7\\right)=-58[\/latex]<\/p>\r\n[\/hidden-answer]\r\n\r\n<\/div>\r\n<\/div>\r\n<\/div>\r\n

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Technology<\/h4>\r\nFor the following exercises, use a graphing calculator to approximate the solutions of the equation. Round to the nearest thousandth.\r\n
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46. [latex]-50=-{\\left(\\frac{1}{2}\\right)}^{-x}[\/latex]<\/p>\r\n\r\n<\/div>\r\n<\/div>\r\n

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\r\n\r\n47. [latex]116=\\frac{1}{4}{\\left(\\frac{1}{8}\\right)}^{x}[\/latex]\r\n\r\n<\/div>\r\n
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48. [latex]x\\approx -2.953[\/latex]<\/p>\r\n\r\n<\/div>\r\n<\/div>\r\n

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49. [latex]12=2{\\left(3\\right)}^{x}+1[\/latex]<\/p>\r\n\r\n<\/div>\r\n<\/div>\r\n

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50. [latex]5=3{\\left(\\frac{1}{2}\\right)}^{x-1}-2[\/latex]<\/p>\r\n\r\n<\/div>\r\n

[reveal-answer q=\"fs-id1165137605832\"]Show Solution[\/reveal-answer]\r\n[hidden-answer a=\"fs-id1165137605832\"]\r\n

[latex]x\\approx -0.222[\/latex]<\/p>\r\n[\/hidden-answer]\r\n\r\n<\/div>\r\n<\/div>\r\n

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51. [latex]-30=-4{\\left(2\\right)}^{x+2}+2[\/latex]<\/p>\r\n\r\n<\/div>\r\n<\/div>\r\n<\/div>\r\n

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Extensions<\/h4>\r\n
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\r\n\r\n52. Explore and discuss the graphs of[latex]\\text{ }F\\left(x\\right)={\\left(b\\right)}^{x}\\text{ }[\/latex]and[latex]\\text{ }G\\left(x\\right)={\\left(\\frac{1}{b}\\right)}^{x}.\\text{ }[\/latex]Then make a conjecture about the relationship between the graphs of the functions[latex]\\text{ }{b}^{x}\\text{ }[\/latex]and[latex]\\text{ }{\\left(\\frac{1}{b}\\right)}^{x}\\text{ }[\/latex]for any real number[latex]\\text{ }b>0.[\/latex]\r\n\r\n<\/div>\r\n
[reveal-answer q=\"fs-id1165137635181\"]Show Solution[\/reveal-answer]\r\n[hidden-answer a=\"fs-id1165137635181\"]\r\n

The graph of[latex]\\text{ }G\\left(x\\right)={\\left(\\frac{1}{b}\\right)}^{x}\\text{ }[\/latex]is the refelction about the y<\/em>-axis of the graph of[latex]\\text{ }F\\left(x\\right)={b}^{x};\\text{ }[\/latex]For any real number[latex]\\text{ }b>0\\text{ }[\/latex]and function[latex]\\text{ }f\\left(x\\right)={b}^{x},[\/latex]the graph of[latex]\\text{ }{\\left(\\frac{1}{b}\\right)}^{x}\\text{ }[\/latex]is the the reflection about the y<\/em>-axis,[latex]\\text{ }F\\left(-x\\right).[\/latex]<\/p>\r\n[\/hidden-answer]\r\n\r\n<\/div>\r\n<\/div>\r\n

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53. Prove the conjecture made in the previous exercise.<\/p>\r\n\r\n<\/div>\r\n<\/div>\r\n

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54. Explore and discuss the graphs of[latex]\\text{ }f\\left(x\\right)={4}^{x},[\/latex][latex]\\text{ }g\\left(x\\right)={4}^{x-2},[\/latex]and[latex]\\text{ }h\\left(x\\right)=\\left(\\frac{1}{16}\\right){4}^{x}.\\text{ }[\/latex]Then make a conjecture about the relationship between the graphs of the functions[latex]\\text{ }{b}^{x}\\text{ }[\/latex]and[latex]\\text{ }\\left(\\frac{1}{{b}^{n}}\\right){b}^{x}\\text{ }[\/latex]for any real number n <\/em>and real number[latex]\\text{ }b>0.[\/latex]<\/p>\r\n\r\n<\/div>\r\n

[reveal-answer q=\"fs-id1165135693738\"]Show Solution[\/reveal-answer]\r\n[hidden-answer a=\"fs-id1165135693738\"]\r\n

The graphs of[latex]\\text{ }g\\left(x\\right)\\text{ }[\/latex]and[latex]\\text{ }h\\left(x\\right)\\text{ }[\/latex]are the same and are a horizontal shift to the right of the graph of[latex]\\text{ }f\\left(x\\right);\\text{ }[\/latex]For any real number n<\/em>, real number[latex]\\text{ }b>0,[\/latex] and function[latex]\\text{ }f\\left(x\\right)={b}^{x},[\/latex] the graph of[latex]\\text{ }\\left(\\frac{1}{{b}^{n}}\\right){b}^{x}\\text{ }[\/latex]is the horizontal shift[latex]\\text{ }f\\left(x-n\\right).[\/latex]<\/p>\r\n[\/hidden-answer]\r\n\r\n<\/div>\r\n<\/div>\r\n

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55. Prove the conjecture made in the previous exercises.<\/p>\r\n\r\n<\/div>\r\n<\/div>\r\n<\/div>\r\n<\/div>\r\n ","rendered":"

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2.3 Section Exercises<\/h3>\n
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Verbal<\/h4>\n
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1. What role does the horizontal asymptote of an exponential function play in telling us about the end behavior of the graph?<\/p>\n<\/div>\n

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Show Solution<\/span><\/p>\n
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An asymptote is a line that the graph of a function approaches, as[latex]\\text{ }x\\text{ }[\/latex]either increases or decreases without bound. The horizontal asymptote of an exponential function tells us the limit of the function\u2019s values as the independent variable gets either extremely large or extremely small.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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2. What is the advantage of knowing how to recognize transformations of the graph of a parent function algebraically?<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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Algebraic<\/h4>\n
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3. The graph of[latex]\\text{ }f\\left(x\\right)={3}^{x}\\text{ }[\/latex]is reflected about the y<\/em>-axis and stretched vertically by a factor of[latex]\\text{ }4.\\text{ }[\/latex]What is the equation of the new function,[latex]\\text{ }g\\left(x\\right)?\\text{ }[\/latex]State its y<\/em>-intercept, domain, and range.<\/p>\n<\/div>\n

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Show Solution<\/span><\/p>\n
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[latex]g\\left(x\\right)=4{\\left(3\\right)}^{-x};\\text{ }[\/latex]y<\/em>-intercept:[latex]\\text{ }\\left(0,4\\right);\\text{ }[\/latex]Domain: all real numbers; Range: all real numbers greater than[latex]\\text{ }0.[\/latex]<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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4. The graph of[latex]\\text{ }f\\left(x\\right)={\\left(\\frac{1}{2}\\right)}^{-x}\\text{ }[\/latex]is reflected about the y<\/em>-axis and compressed vertically by a factor of[latex]\\text{ }\\frac{1}{5}.\\text{ }[\/latex]What is the equation of the new function,[latex]\\text{ }g\\left(x\\right)?\\text{ }[\/latex]State its y<\/em>-intercept, domain, and range.<\/p>\n<\/div>\n<\/div>\n

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5. The graph of[latex]\\text{ }f\\left(x\\right)={10}^{x}\\text{ }[\/latex]is reflected about the x<\/em>-axis and shifted upward[latex]\\text{ }7\\text{ }[\/latex]units. What is the equation of the new function,[latex]\\text{ }g\\left(x\\right)?\\text{ }[\/latex]State its y<\/em>-intercept, domain, and range.<\/p>\n<\/div>\n

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Show Solution<\/span><\/p>\n
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[latex]g\\left(x\\right)=-{10}^{x}+7;\\text{ }[\/latex]y<\/em>-intercept:[latex]\\text{ }\\left(0,6\\right);\\text{ }[\/latex]Domain: all real numbers; Range: all real numbers less than[latex]\\text{ }7.[\/latex]<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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6. The graph of[latex]\\text{ }f\\left(x\\right)={\\left(1.68\\right)}^{x}\\text{ }[\/latex]is shifted right[latex]\\text{ }3\\text{ }[\/latex]units, stretched vertically by a factor of[latex]\\text{ }2,[\/latex]reflected about the x<\/em>-axis, and then shifted downward[latex]\\text{ }3\\text{ }[\/latex]units. What is the equation of the new function,[latex]\\text{ }g\\left(x\\right)?\\text{ }[\/latex]State its y<\/em>-intercept (to the nearest thousandth), domain, and range.<\/p>\n<\/div>\n<\/div>\n

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7. The graph of[latex]\\text{ }f\\left(x\\right)=2{\\left(\\frac{1}{4}\\right)}^{x-20}[\/latex] is shifted left[latex]\\text{ }2\\text{ }[\/latex]units, stretched vertically by a factor of[latex]\\text{ }4,[\/latex]reflected about the x<\/em>-axis, and then shifted downward[latex]\\text{ }4\\text{ }[\/latex]units. What is the equation of the new function,[latex]\\text{ }g\\left(x\\right)?\\text{ }[\/latex]State its y<\/em>-intercept, domain, and range.<\/p>\n<\/div>\n

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Show Solution<\/span><\/p>\n
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[latex]g\\left(x\\right)=2{\\left(\\frac{1}{4}\\right)}^{x};\\text{ }[\/latex] y<\/em>-intercept:[latex]\\text{ }\\left(0,\\text{ 2}\\right);\\text{ }[\/latex]Domain: all real numbers; Range: all real numbers greater than[latex]\\text{ }0.[\/latex]<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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Graphical<\/h4>\n

For the following exercises, graph the function and its reflection about the y<\/em>-axis on the same axes, and give the y<\/em>-intercept.<\/p>\n

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8. [latex]f\\left(x\\right)=3{\\left(\\frac{1}{2}\\right)}^{x}[\/latex]<\/p>\n<\/div>\n<\/div>\n

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9. [latex]g\\left(x\\right)=-2{\\left(0.25\\right)}^{x}[\/latex]<\/p>\n

Show Answer<\/span> <\/p>\n
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\"Graph\u00a0y<\/em>-intercept:[latex]\\text{ }\\left(0,-2\\right)[\/latex]<\/p>\n

<\/div>\n<\/div>\n

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10. [latex]h\\left(x\\right)=6{\\left(1.75\\right)}^{-x}[\/latex]<\/p>\n<\/div>\n<\/div>\n

For the following exercises, graph each set of functions on the same axes.<\/p>\n

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11. [latex]f\\left(x\\right)=3{\\left(\\frac{1}{4}\\right)}^{x},[\/latex][latex]g\\left(x\\right)=3{\\left(2\\right)}^{x},[\/latex]and[latex]\\text{ }h\\left(x\\right)=3{\\left(4\\right)}^{x}[\/latex]<\/p>\n<\/div>\n

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Show Solution<\/span><\/p>\n
\"Graph<\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n
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12. [latex]f\\left(x\\right)=\\frac{1}{4}{\\left(3\\right)}^{x},[\/latex][latex]g\\left(x\\right)=2{\\left(3\\right)}^{x},[\/latex]and[latex]\\text{ }h\\left(x\\right)=4{\\left(3\\right)}^{x}[\/latex]<\/p>\n<\/div>\n<\/div>\n

For the following exercises, match each function with one of the graphs in (Figure)<\/a>.<\/p>\n

\"Graph<\/span><\/div>\n
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13. [latex]f\\left(x\\right)=2{\\left(0.69\\right)}^{x}[\/latex]<\/p>\n<\/div>\n

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Show Solution<\/span><\/p>\n
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B<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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14. [latex]f\\left(x\\right)=2{\\left(1.28\\right)}^{x}[\/latex]<\/p>\n<\/div>\n<\/div>\n

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15. [latex]f\\left(x\\right)=2{\\left(0.81\\right)}^{x}[\/latex]<\/p>\n<\/div>\n

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Show Answer<\/span><\/p>\n
A<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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16. [latex]f\\left(x\\right)=4{\\left(1.28\\right)}^{x}[\/latex]<\/p>\n<\/div>\n<\/div>\n

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17. [latex]f\\left(x\\right)=2{\\left(1.59\\right)}^{x}[\/latex]<\/p>\n<\/div>\n

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Show Solution<\/span><\/p>\n
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E<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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18. [latex]f\\left(x\\right)=4{\\left(0.69\\right)}^{x}[\/latex]<\/p>\n<\/div>\n<\/div>\n

For the following exercises, use the graphs shown in (Figure)<\/a>. All have the form[latex]\\text{ }f\\left(x\\right)=a{b}^{x}.[\/latex]<\/p>\n

\"Graph<\/span><\/div>\n
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19. Which graph has the largest value for[latex]\\text{ }b?[\/latex]<\/p>\n<\/div>\n

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Show Solution<\/span><\/p>\n
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D<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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20. Which graph has the smallest value for[latex]\\text{ }b?[\/latex]<\/p>\n<\/div>\n<\/div>\n

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21. Which graph has the largest value for[latex]\\text{ }a?[\/latex]<\/p>\n<\/div>\n

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Show Solution<\/span><\/p>\n
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C<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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22. Which graph has the smallest value for[latex]\\text{ }a?[\/latex]<\/p>\n<\/div>\n<\/div>\n

For the following exercises, graph the function and its reflection about the x<\/em>-axis on the same axes.<\/p>\n

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23. [latex]f\\left(x\\right)=\\frac{1}{2}{\\left(4\\right)}^{x}[\/latex]<\/p>\n<\/div>\n

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Show Solution<\/span><\/p>\n
\"Graph<\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n
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24. [latex]f\\left(x\\right)=3{\\left(0.75\\right)}^{x}-1[\/latex]<\/p>\n<\/div>\n<\/div>\n

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25. [latex]f\\left(x\\right)=-4{\\left(2\\right)}^{x}+2[\/latex]<\/p>\n<\/div>\n

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Show Solution<\/span><\/p>\n
\"Graph<\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n

For the following exercises, graph the transformation of[latex]\\text{ }f\\left(x\\right)={2}^{x}.\\text{ }[\/latex]Give the horizontal asymptote, the domain, and the range.<\/p>\n

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26. [latex]f\\left(x\\right)={2}^{-x}[\/latex]<\/p>\n<\/div>\n<\/div>\n

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27. [latex]h\\left(x\\right)={2}^{x}+3[\/latex]<\/p>\n<\/div>\n

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Show Solution<\/span><\/p>\n
\"Graph<\/span><\/p>\n

Horizontal asymptote:[latex]\\text{ }h\\left(x\\right)=3;[\/latex] Domain: all real numbers; Range: all real numbers strictly greater than[latex]\\text{ }3.[\/latex]<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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28. [latex]f\\left(x\\right)={2}^{x-2}[\/latex]<\/p>\n<\/div>\n<\/div>\n

For the following exercises, describe the end behavior of the graphs of the functions.<\/p>\n

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29. [latex]f\\left(x\\right)=-5{\\left(4\\right)}^{x}-1[\/latex]<\/p>\n<\/div>\n

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Show Solution<\/span><\/p>\n
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As [latex]x\\to \\infty[\/latex], [latex]f\\left(x\\right)\\to -\\infty[\/latex];<\/p>\n

As [latex]x\\to -\\infty[\/latex], [latex]f\\left(x\\right)\\to -1[\/latex]<\/p>\n

<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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30. [latex]f\\left(x\\right)=3{\\left(\\frac{1}{2}\\right)}^{x}-2[\/latex]<\/p>\n<\/div>\n<\/div>\n

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31. [latex]f\\left(x\\right)=3{\\left(4\\right)}^{-x}+2[\/latex]<\/p>\n<\/div>\n

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Show Solution<\/span><\/p>\n
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As [latex]x\\to \\infty[\/latex], [latex]f\\left(x\\right)\\to 2[\/latex];<\/p>\n

As [latex]x\\to -\\infty[\/latex], [latex]f\\left(x\\right)\\to \\infty[\/latex]<\/p>\n

<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

For the following exercises, start with the graph of[latex]\\text{ }f\\left(x\\right)={4}^{x}.\\text{ }[\/latex]Then write a function that results from the given transformation.<\/p>\n

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32. Shift [latex]f\\left(x\\right)[\/latex] 4 units upward<\/p>\n<\/div>\n<\/div>\n

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33. Shift[latex]\\text{ }f\\left(x\\right)\\text{ }[\/latex]3 units downward<\/p>\n<\/div>\n

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Show Solution<\/span><\/p>\n
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[latex]f\\left(x\\right)={4}^{x}-3[\/latex]<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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34. Shift[latex]\\text{ }f\\left(x\\right)\\text{ }[\/latex]2 units left<\/p>\n<\/div>\n<\/div>\n

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35. Shift[latex]\\text{ }f\\left(x\\right)\\text{ }[\/latex]5 units right<\/p>\n<\/div>\n

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Show Solution<\/span><\/p>\n
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[latex]f\\left(x\\right)={4}^{x-5}[\/latex]<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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36. Reflect[latex]\\text{ }f\\left(x\\right)\\text{ }[\/latex]about the x<\/em>-axis<\/p>\n<\/div>\n<\/div>\n

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37. Reflect[latex]\\text{ }f\\left(x\\right)\\text{ }[\/latex]about the y<\/em>-axis<\/p>\n<\/div>\n

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Show Solution<\/span><\/p>\n
[latex]f\\left(x\\right)={4}^{-x}[\/latex]<\/div>\n<\/div>\n<\/div>\n<\/div>\n

For the following exercises, each graph is a transformation of[latex]\\text{ }y={2}^{x}.\\text{ }[\/latex]Write an equation describing the transformation.<\/p>\n

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38.\u00a0\"Graph<\/span><\/p>\n<\/div>\n<\/div>\n

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39.\u00a0\"Graph<\/span><\/p>\n<\/div>\n

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Show Solution<\/span><\/p>\n
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[latex]y=-{2}^{x}+3[\/latex]<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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40.\u00a0\"Graph<\/span><\/p>\n<\/div>\n<\/div>\n

For the following exercises, find an exponential equation for the graph.<\/p>\n

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41.\u00a0\"Graph<\/span><\/p>\n<\/div>\n

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Show Answer<\/span><\/p>\n
[latex]y=-2{\\left(3\\right)}^{x}+7[\/latex]<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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42.\u00a0\"Graph<\/span><\/p>\n<\/div>\n<\/div>\n<\/div>\n

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Numeric<\/h4>\n

For the following exercises, evaluate the exponential functions for the indicated value of[latex]\\text{ }x.[\/latex]<\/p>\n

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43. [latex]g\\left(x\\right)=\\frac{1}{3}{\\left(7\\right)}^{x-2}\\text{ }[\/latex]for[latex]\\text{ }g\\left(6\\right).[\/latex]<\/p>\n<\/div>\n

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Show Solution<\/span><\/p>\n
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[latex]g\\left(6\\right)=800+\\frac{1}{3}\\approx 800.3333[\/latex]<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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44. [latex]f\\left(x\\right)=4{\\left(2\\right)}^{x-1}-2\\text{ }[\/latex]for[latex]\\text{ }f\\left(5\\right).[\/latex]<\/p>\n<\/div>\n<\/div>\n

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45. [latex]h\\left(x\\right)=-\\frac{1}{2}{\\left(\\frac{1}{2}\\right)}^{x}+6\\text{ }[\/latex]for[latex]\\text{ }h\\left(-7\\right).[\/latex]<\/p>\n<\/div>\n

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Show Solution<\/span><\/p>\n
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[latex]h\\left(-7\\right)=-58[\/latex]<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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Technology<\/h4>\n

For the following exercises, use a graphing calculator to approximate the solutions of the equation. Round to the nearest thousandth.<\/p>\n

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46. [latex]-50=-{\\left(\\frac{1}{2}\\right)}^{-x}[\/latex]<\/p>\n<\/div>\n<\/div>\n

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47. [latex]116=\\frac{1}{4}{\\left(\\frac{1}{8}\\right)}^{x}[\/latex]<\/p>\n<\/div>\n

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48. [latex]x\\approx -2.953[\/latex]<\/p>\n<\/div>\n<\/div>\n

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49. [latex]12=2{\\left(3\\right)}^{x}+1[\/latex]<\/p>\n<\/div>\n<\/div>\n

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50. [latex]5=3{\\left(\\frac{1}{2}\\right)}^{x-1}-2[\/latex]<\/p>\n<\/div>\n

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Show Solution<\/span><\/p>\n
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[latex]x\\approx -0.222[\/latex]<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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51. [latex]-30=-4{\\left(2\\right)}^{x+2}+2[\/latex]<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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Extensions<\/h4>\n
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52. Explore and discuss the graphs of[latex]\\text{ }F\\left(x\\right)={\\left(b\\right)}^{x}\\text{ }[\/latex]and[latex]\\text{ }G\\left(x\\right)={\\left(\\frac{1}{b}\\right)}^{x}.\\text{ }[\/latex]Then make a conjecture about the relationship between the graphs of the functions[latex]\\text{ }{b}^{x}\\text{ }[\/latex]and[latex]\\text{ }{\\left(\\frac{1}{b}\\right)}^{x}\\text{ }[\/latex]for any real number[latex]\\text{ }b>0.[\/latex]<\/p>\n<\/div>\n

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Show Solution<\/span><\/p>\n
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The graph of[latex]\\text{ }G\\left(x\\right)={\\left(\\frac{1}{b}\\right)}^{x}\\text{ }[\/latex]is the refelction about the y<\/em>-axis of the graph of[latex]\\text{ }F\\left(x\\right)={b}^{x};\\text{ }[\/latex]For any real number[latex]\\text{ }b>0\\text{ }[\/latex]and function[latex]\\text{ }f\\left(x\\right)={b}^{x},[\/latex]the graph of[latex]\\text{ }{\\left(\\frac{1}{b}\\right)}^{x}\\text{ }[\/latex]is the the reflection about the y<\/em>-axis,[latex]\\text{ }F\\left(-x\\right).[\/latex]<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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53. Prove the conjecture made in the previous exercise.<\/p>\n<\/div>\n<\/div>\n

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54. Explore and discuss the graphs of[latex]\\text{ }f\\left(x\\right)={4}^{x},[\/latex][latex]\\text{ }g\\left(x\\right)={4}^{x-2},[\/latex]and[latex]\\text{ }h\\left(x\\right)=\\left(\\frac{1}{16}\\right){4}^{x}.\\text{ }[\/latex]Then make a conjecture about the relationship between the graphs of the functions[latex]\\text{ }{b}^{x}\\text{ }[\/latex]and[latex]\\text{ }\\left(\\frac{1}{{b}^{n}}\\right){b}^{x}\\text{ }[\/latex]for any real number n <\/em>and real number[latex]\\text{ }b>0.[\/latex]<\/p>\n<\/div>\n

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Show Solution<\/span><\/p>\n
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The graphs of[latex]\\text{ }g\\left(x\\right)\\text{ }[\/latex]and[latex]\\text{ }h\\left(x\\right)\\text{ }[\/latex]are the same and are a horizontal shift to the right of the graph of[latex]\\text{ }f\\left(x\\right);\\text{ }[\/latex]For any real number n<\/em>, real number[latex]\\text{ }b>0,[\/latex] and function[latex]\\text{ }f\\left(x\\right)={b}^{x},[\/latex] the graph of[latex]\\text{ }\\left(\\frac{1}{{b}^{n}}\\right){b}^{x}\\text{ }[\/latex]is the horizontal shift[latex]\\text{ }f\\left(x-n\\right).[\/latex]<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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\n

55. Prove the conjecture made in the previous exercises.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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