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x\left(y^{2}-9\right)
Factor out x.
\left(y-3\right)\left(y+3\right)
Consider y^{2}-9. Rewrite y^{2}-9 as y^{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\left(y-3\right)\left(y+3\right)
Rewrite the complete factored expression.