Hi there my pre calc teacher is no help whatsoever so please someone guide me through questions 3 - 87 by multiples of 3 so questions 3, 6, 9, 12, and so on. Thank you a ton! ?

Practice Exercises 45. x4 - 16 46. x4 - 1 In Exercises 1-10, factor out the greatest common factor. 47. 16x4 - 81 48. 81x4 - 1 1. 18x + 27 2. 16x - 24 In Exercises 49-56, factor each perfect square trinomial. 3. 3x2 + 6x 4. 4x2 - 8x 49. x2 + 2x + 1 50. x2 + 4x + 4 5. 9x4 - 18x3 + 27x2 6. 6x4 - 18x3 + 12x2 51. x2 - 14x + 49 52. x2 - 10x + 25 7. x(x + 5)+ 3(x + 5) 8. x(2x + 1) + 4(2x + 1) 53. 4x2 + 4x + 1 54. 25x2 + 10x + 1 9. x2(x - 3) + 12(x - 3) 10. x2(2x + 5) + 17(2x + 5) 55. 9x2 - 6x + 1 56. 64x2 - 16x + 1 In Exercises 11-16, factor by grouping. In Exercises 57-64, factor using the formula for the sum or 1. x - 2x2 + 5x - 10 12. x3 - 3x2 + 4x - 12 difference of two cubes. 13. x3 - x2 + 2x - 2 14. x3 + 6x2 - 2x - 12 57. x3 + 27 58. x3 + 64 15. 3x3 - 2x2 - 6x + 4 16. x3 - x2 - 5x + 5 59. x3 - 64 60. x3 - 27 In Exercises 17-38, factor each trinomial, or state that the 61. 873 - 1 62. 27x3 - 1 trinomial is prime. 63. 64x3 + 27 64. & + 125 17. x2 + 5x + 6 18. x2 + 8x + 15 In Exercises 65-92, factor completely, or state that the polynomu 19. x2 - 2x - 15 20. x2 - 4x - 5 is prime. 21. x2 - 8x + 15 22. x2 - 14x + 45 65. 3x3 - 3x 66. 5x3 - 45x 23. 3x2 - x - 2 24. 2x2 + 5x - 3 67. 4x2 - 4x - 24 68. 6x2 - 18x - 60 25. 3x2 - 25x - 28 26. 3x2 - 2x - 5 69. 2x4 - 162 70. 7x4 - 7 27. 6x2 - 11x + 4 28. 6x2 - 17x + 12 71. x + 2x2 - 9x - 18 72. x3 + 3x2 - 25x - 75 29. 4x2 + 16x + 15 30. 8x2 + 33x + 4 73. 2x2 - 2x - 112 74. 6x2 - 6x - 12 31. 9x2 - 9x + 2 32. 9x2+ 5x - 4 75. x - 4x 76. 9x3 - 9x 33. 20x2 + 27x - 8 34. 15x2 - 19x + 6 77. x2+ 64 78. x2+ 36 35. 2x2 + 3xy + yz 36. 3x2 + 4xy + yz 79. x3 + 2x2 - 4x - 8 80. x3 + 2x2 - x - 2 37. 6x2 - 5xy - 62 38. 6x2 - 7xy - 5y2 81. y - 81y 82. y - 16y In Exercises 39-48, factor the difference of two squares. 83. 20y4 - 45y2 84. 48y4 - 32 39. x2 - 100 40. x2 - 144 85. x2 - 12x + 36 - 492 86. x2 - 10x + 25 - 36y2 41. 36x2 - 49 42. 64x2 - 81 87. 962x - 16y - 16x + 962y 43. 9x2 - 25y 44. 36x2 - 492 88. 16a2x - 25y - 25x + 16aly