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Anonymous
4x2 - 36x + 81 = 4x2 - 18x - 18x +81 = 2x(2x - 9) - 9(2x - 9) = (2x - 9)2
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(2x - 9)(2x - 9)
4x2+20x+25 (2x+5)^2
The GCF is 4x2.
(x + 1)(x - 2)(x + 5)
If that's + 4x2, the answer is 2x(x2 + 2x - 4)
4x