Answer
$ x^3-6x^2+12x-8$
Work Step by Step
We cube (expand) the binomial as follows:
$$
(x - 2)^3=(x-2)(x-2)(x-2)=x^3+3x(-2)^2+3(-2)x^2+(-2)^3\\
= x^3-6x^2+12x-8
.$$
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