Evaluate
\left(x-3\right)\left(x+9\right)
Expand
x^{2}+6x-27
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x^{2}+6x+9-36
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+3\right)^{2}.
x^{2}+6x-27
Subtract 36 from 9 to get -27.
x^{2}+6x+9-36
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+3\right)^{2}.
x^{2}+6x-27
Subtract 36 from 9 to get -27.
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