In Exercises 45–68, factor by grouping. 45. x + 3x + 5x + 15 46. x + 2x + 4x + 8 47. x2 + 7x 4х — 28 48. x + 3x 5х — 15 49. x 3x + 4x – 12 50. x 2x2 + 5x 10 51. ху бх + 2y — 12 52. ху — 5х + 9у - 45 53. ху + х — 7у - 7 54. ху + х — 5у 55. 10х2 — 12ху + 35ху — 42у? 56. Зx? — бху + 5ху — 10у? 57. 4x - x? – 12x + 3 5 58. Зx3 — 2х2 бх + 4 59. x2 bx + ab - ax - 60. х + ах - bx ab 61. x 12 - 3x2 + 4x 62. 2x3 10 + 4x2 5x | 63. ау — by + bx dx + dy – cy ах 64. cx 65. ay? + 2by? -Зах 6. За?х + ба?у 6bx 2bx 4by 67. x"y" + 3x" + y" + 3 68. x"y" – x" + 2y" – 2

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