Problem Set 16: Dividing Polynomials

1. If division of a polynomial by a binomial results in a remainder of zero, what can be conclude?

2. If a polynomial of degree n is divided by a binomial of degree 1, what is the degree of the quotient?

For the following exercises, use long division to divide. Specify the quotient and the remainder.

3. (x2+5x1)÷(x1)(x2+5x1)÷(x1)

4. (2x29x5)÷(x5)(2x29x5)÷(x5)

5. (3x2+23x+14)÷(x+7)(3x2+23x+14)÷(x+7)

6. (4x210x+6)÷(4x+2)(4x210x+6)÷(4x+2)

7. (6x225x25)÷(6x+5)(6x225x25)÷(6x+5)

8. (x21)÷(x+1)(x21)÷(x+1)

9. (2x23x+2)÷(x+2)(2x23x+2)÷(x+2)

10. (x3126)÷(x5)(x3126)÷(x5)

11. (3x25x+4)÷(3x+1)(3x25x+4)÷(3x+1)

12. (x33x2+5x6)÷(x2)(x33x2+5x6)÷(x2)

13. (2x3+3x24x+15)÷(x+3)(2x3+3x24x+15)÷(x+3)

For the following exercises, use synthetic division to find the quotient.

14. (3x32x2+x4)÷(x+3)(3x32x2+x4)÷(x+3)

15. (2x36x27x+6)÷(x4)

16. (6x310x27x15)÷(x+1)

17. (4x312x25x1)÷(2x+1)

18. (9x39x2+18x+5)÷(3x1)

19. (3x32x2+x4)÷(x+3)

20. (6x3+x24)÷(2x3)

21. (2x3+7x213x3)÷(2x3)

22. (3x35x2+2x+3)÷(x+2)

23. (4x35x2+13)÷(x+4)

24. (x33x+2)÷(x+2)

25. (x321x2+147x343)÷(x7)

26. (x315x2+75x125)÷(x5)

27. (9x3x+2)÷(3x1)

28. (6x3x2+5x+2)÷(3x+1)

29. (x4+x33x22x+1)÷(x+1)

30. (x43x2+1)÷(x1)

31. (x4+2x33x2+2x+6)÷(x+3)

32. (x410x3+37x260x+36)÷(x2)

33. (x48x3+24x232x+16)÷(x2)

34. (x4+5x33x213x+10)÷(x+5)

35. (x412x3+54x2108x+81)÷(x3)

36. (4x42x34x+2)÷(2x1)

37. (4x4+2x34x2+2x+2)÷(2x+1)

For the following exercises, use the graph of the third-degree polynomial and one factor to write the factored form of the polynomial suggested by the graph. The leading coefficient is one.

38. Factor is x2x+3
Graph of a polynomial that has a x-intercept at -1.

39. Factor is (x2+2x+4)
Graph of a polynomial that has a x-intercept at 1.

40. Factor is x2+2x+5
Graph of a polynomial that has a x-intercept at 2.

41. Factor is x2+x+1
Graph of a polynomial that has a x-intercept at 5.

42. Factor is x2+2x+2
Graph of a polynomial that has a x-intercept at -3.

For the following exercises, use synthetic division to find the quotient and remainder.

43. 4x333x2

44. 2x3+25x+3

45. 3x3+2x5x1

46. 4x3x212x+4

47. x422x+2

For the following exercises, use a calculator with CAS to answer the questions.

48. Consider xk1x1 with k=1,2,3. What do you expect the result to be if k = 4?

49. Consider xk+1x+1 for k=1,3,5. What do you expect the result to be if k = 7?

50. Consider x4k4xk for k=1,2,3. What do you expect the result to be if k = 4?

51. Consider xkx+1 with k=1,2,3. What do you expect the result to be if k = 4?

52. Consider xkx1 with k=1,2,3. What do you expect the result to be if k = 4?

For the following exercises, use synthetic division to determine the quotient involving a complex number.

53. x+1xi

54. x2+1xi

55. x+1x+i

56. x2+1x+i

57. x3+1xi

For the following exercises, use the given length and area of a rectangle to express the width algebraically.

58. Length is x+5, area is 2x2+9x5.

59. Length is 2x + 5, area is 4x3+10x2+6x+15

60. Length is 3x4, area is 6x48x3+9x29x4

For the following exercises, use the given volume of a box and its length and width to express the height of the box algebraically.

61. Volume is 12x3+20x221x36, length is 2x+3, width is 3x4.

62. Volume is 18x321x240x+48, length is 3x4, width is 3x4.

63. Volume is 10x3+27x2+2x24, length is 5x4, width is 2x+3.

64. Volume is 10x3+30x28x24, length is 2, width is x+3.

For the following exercises, use the given volume and radius of a cylinder to express the height of the cylinder algebraically.

65. Volume is π(25x365x229x3), radius is 5x+1.

66. Volume is π(4x3+12x215x50), radius is 2x+5.

67. Volume is π(3x4+24x3+46x216x32), radius is x+4.