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x3 + x = x2(x + 1)
x3 + 1 = (x + 1)(x2 - x + 1) The x + 1's cancel out, leaving x2 - x + 1
x3 - 3x2 + x - 3 = (x - 3)(x2 + 1)
x3 - 2x2 + x - 2 =(x - 2)(x2 + 1)
x3 + x2 + 4x + 4 = (x2 + 4)(x + 1)