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w3+125
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(x + 3)(x^2 - 3x + 9)
x3 + x = x(x2+1)
2(x^2 + 2)(x + 3)
125 = 5 x 5 x 5... or 125 = 5 cubed.
x3 + 1 = (x + 1)(x2 - x + 1) The x + 1's cancel out, leaving x2 - x + 1