Practice and Applications

  1. 9. 12ax + 15a2

  2. 11. 9a2 − 16b2

  3. 13. b2 + 6b − 16

  4. 15. 5(s + 4t)

  5. 17. a2(x2 + 1)

  6. 19. bx(Wb + 12)(Wb − 12)

  7. 21. (4x + 8 + t2)(4x + 8 − t2)

  8. 23. 4(3t − 1)2

  9. 25. (5t + 1)2

  10. 27. (x + 7)(x − 6)

  11. 29. (t + 3)(t − 3)(t2 + 4)

  12. 31. (2k − 9)(k + 4)

  13. 33. 2(2x + 5)(2x − 7)

  14. 35. (5b − 1)(2b + 5)

  15. 37. 4(x + 2y)(x − 2y)

  16. 39. 2(5 − 2y2)(25 + 10y2 + 4y4)

  17. 41. (2x + 3)(4x2 − 6x + 9)

  18. 43. (a − 3)(b2 + 1)

  19. 45. (x + 5)(n − x + 5)

  20. 47. 16x23a2

  21. 49. 3x + 1x − 1

  22. 51. 165x(x − y)

  23. 53.  − 6L − 5

  24. 55. x + 22x(7x − 1)

  25. 57. 1x − 1

  26. 59. 16x − 1536x2

  27. 61. 5y + 62xy

  28. 63. 2(3a + 1)a(a + 2)

  29. 65. 4x2 − x + 12x(x + 3)(x − 1)

  30. 67. 12x2 − 7x − 42(x − 1)(x + 1)(4x − 1)

  31. 69. x3 + 6x2 − 2x + 2x(x − 1)(x + 3)

  32. 71.

      

  33. 73.

  34. 75. 2

  35. 77.  − (a − 1)22a

  36. 79. 103

  37. 81.  − 6

  38. 83.

    1. Sign changes

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