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(x - 1)^3 - 2^3 =
[ (x - 1) - 2 ] [ (x - 1)^2 + (x - 1) * 2 + 2^2 ] =
(x - 1 - 2)(x^2 - 2x +1 + 2x - 2 + 4) = (x - 3)(x^2 = 3)
a^3 - b^3 = (a - b)(a^2 + ab + b^2)
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(x - 1)^3 - 2^3 =
[ (x - 1) - 2 ] [ (x - 1)^2 + (x - 1) * 2 + 2^2 ] =
(x - 1 - 2)(x^2 - 2x +1 + 2x - 2 + 4) = (x - 3)(x^2 = 3)
a^3 - b^3 = (a - b)(a^2 + ab + b^2)