Evaluate
\left(x-18\right)\left(x-12\right)
Expand
x^{2}-30x+216
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x^{2}-30x+225-9
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x-15\right)^{2}.
x^{2}-30x+216
Subtract 9 from 225 to get 216.
x^{2}-30x+225-9
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x-15\right)^{2}.
x^{2}-30x+216
Subtract 9 from 225 to get 216.
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