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X2 + 4x
x(x + 4)
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(4x-3)(x+2)
It is: 4x -34x^2 -21 simplified
X3 + 8= (x+2)(x2-2x+4)
4x-x2 = 2
12x2 - 7x + 1 = 12x2 - 4x - 3x + 1 = 4x(3x - 1) - 1(3x - 1) = (3x - 1)(4x - 1)