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x^{2}-9
Multiply and combine like terms.
\left(x-3\right)\left(x+3\right)
Rewrite x^{2}-9 as x^{2}-3^{2}. The difference of squares can be factored using the rule: a^{2}-b^{2}=\left(a-b\right)\left(a+b\right).
x^{2}-9
Subtract 18 from 9 to get -9.