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x^2 - 8x - 9
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X2 + 8x + 16 = 10x +16x2 + 8x + 16=2x + 8x + 16=10x + 16
x2 + 8x - 20 = (x - 2)(x + 10).
x2 + 8x + 15 = (x + 3)(x + 5)
Also 64
-8x-9+(-18) -8x-9-18 -8x-27 is your simplified answer