x2-8x+15 = (x-3)(x-5)
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First add 15 and 45. Then find the factors. 15+45=60 The factors of 60 are 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, and 30.
5(x + 3)
(2x - 5)(2x - 3)
3(3x + 5)
3 is a factor and dividing by 3 gives x + 15 = 8x