Evaluate
\left(x-10\right)\left(x-2\right)
Expand
x^{2}-12x+20
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x^{2}-12x+36-16
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x-6\right)^{2}.
x^{2}-12x+20
Subtract 16 from 36 to get 20.
x^{2}-12x+36-16
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x-6\right)^{2}.
x^{2}-12x+20
Subtract 16 from 36 to get 20.
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