x2 + 8x - 9 factors to (x - 1)(x + 9)
x2 - 1 factors to (x - 1)(x + 1)
The LCM will be (x - 1)(x + 1)(x + 9) or x3 + 9x2 - x - 9
The GCF is (x - 1)
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4x2 + 8x + 4 = 4 (x2 + 2x + 1) = 4 (x + 1)2
Take out the common factor, 3: 3x + 6 = 3(x + 2).
(x + 4)(x + 1)
(x + 2)(x - 1)
x2+6x-7 = (x+7)(x-1) when factored