Evaluate
\left(x-10\right)\left(x-4\right)
Expand
x^{2}-14x+40
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x^{2}-14x+49-9
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x-7\right)^{2}.
x^{2}-14x+40
Subtract 9 from 49 to get 40.
x^{2}-14x+49-9
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x-7\right)^{2}.
x^{2}-14x+40
Subtract 9 from 49 to get 40.
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