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Anonymous
(X + 1)3 = X3 + 3X2 + 3X + 1
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(x - 1)(x - 1)(x - 1) - (x + 1)(x + 1)(x + 1)
x(x + 9)(x + 1)
If that's 5x2, it factors to (x + 5)(x2 + 1)
x is approximately 0.7549
(x - 1)(2x^2-1)