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x^{3}-6x^{2}+12x-8-4
Use binomial theorem \left(a-b\right)^{3}=a^{3}-3a^{2}b+3ab^{2}-b^{3} to expand \left(x-2\right)^{3}.
x^{3}-6x^{2}+12x-12
Subtract 4 from -8 to get -12.
x^{3}-6x^{2}+12x-8-4
Use binomial theorem \left(a-b\right)^{3}=a^{3}-3a^{2}b+3ab^{2}-b^{3} to expand \left(x-2\right)^{3}.
x^{3}-6x^{2}+12x-12
Subtract 4 from -8 to get -12.