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