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(2x2 - 1)(2x2 - 1) or (2x2 - 1)2
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4(x - 1)(x + 1)
(2x - 1)(4x2 + 2x + 1)
The GCF is 4x2.
If that's + 4x2, the answer is 2x(x2 + 2x - 4)
4x2+20x+25 (2x+5)^2