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