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x2 + 12x + 27 = (x + 9)(x + 3)
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x2 - 12x + 36 = (x - 6)2
x2+12x+11=0 (x+11)(x+1)=0 x=-11 or x=-1
-x2 + 2x + 48 = (-x - 6)(x - 8)
(x + 1)(x + 5)
x² + 8x + 15 = (x + 5)(x + 3)