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(x + 12)(x - 8)
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X2 + 4xx(x + 4)=======
x3 + 3x2 - 4x -12 x2(x + 3) - 4(x + 3) (x2 - 4)(x+3)
It is: 4x -34x^2 -21 simplified
2(x+1)^2
4x-x2 = 2