Expand
343-147x+21x^{2}-x^{3}
Evaluate
\left(7-x\right)^{3}
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343-147x+21x^{2}-x^{3}
Use binomial theorem \left(a-b\right)^{3}=a^{3}-3a^{2}b+3ab^{2}-b^{3} to expand \left(7-x\right)^{3}.
343-147x+21x^{2}-x^{3}
Use binomial theorem \left(a-b\right)^{3}=a^{3}-3a^{2}b+3ab^{2}-b^{3} to expand \left(7-x\right)^{3}.
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