Evaluate
\left(x-7\right)\left(x-1\right)
Expand
x^{2}-8x+7
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x^{2}-8x+16-9
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x-4\right)^{2}.
x^{2}-8x+7
Subtract 9 from 16 to get 7.
x^{2}-8x+16-9
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x-4\right)^{2}.
x^{2}-8x+7
Subtract 9 from 16 to get 7.
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