Evaluate
\left(x-5\right)\left(x+3\right)
Expand
x^{2}-2x-15
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1-2x+x^{2}-16
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(1-x\right)^{2}.
-15-2x+x^{2}
Subtract 16 from 1 to get -15.
1-2x+x^{2}-16
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(1-x\right)^{2}.
-15-2x+x^{2}
Subtract 16 from 1 to get -15.
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