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Anonymous
The difference of two squares a2 - b2 factors to (a - b)(a + b)
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2(x + 1)
2(X - 1)
2(x + 13)
The GCF of 2x and 12 is 2.
(2x - 9)(2x - 9) or (2x - 9)2
x2+2x-63 = (x-7)(x+9) when factored
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