If it's + 7x, the answer is (2x + 3)(5x - 4)
If it's - 7x, the answer is (2x - 3)(5x + 4)
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(14x^3 - 10x^2) = 2x^2(7x - 5) 63x - 45 = 9(7x - 5) 14x^3 - 10x^2 + 63x - 45 = (2x^2 + 9)(7x - 5)
10x2-5x-5 = (10x+5)(x-1)
5x(2x - 3)
Since 7x is a factor of 14xy, it is automatically the GCF.
(7x + 8)(7x - 8)