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6x^{2}-12x+8
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6x^{2}-12x+8
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x^{3}+8-12x+6x^{2}-x^{3}
Use binomial theorem \left(a-b\right)^{3}=a^{3}-3a^{2}b+3ab^{2}-b^{3} to expand \left(2-x\right)^{3}.
8-12x+6x^{2}
Combine x^{3} and -x^{3} to get 0.
x^{3}+8-12x+6x^{2}-x^{3}
Use binomial theorem \left(a-b\right)^{3}=a^{3}-3a^{2}b+3ab^{2}-b^{3} to expand \left(2-x\right)^{3}.
8-12x+6x^{2}
Combine x^{3} and -x^{3} to get 0.
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