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2\left(1-9x^{2}\right)
Factor out 2.
\left(1-3x\right)\left(1+3x\right)
Consider 1-9x^{2}. Rewrite 1-9x^{2} as 1^{2}-\left(3x\right)^{2}. The difference of squares can be factored using the rule: a^{2}-b^{2}=\left(a-b\right)\left(a+b\right).
\left(-3x+1\right)\left(3x+1\right)
Reorder the terms.
2\left(-3x+1\right)\left(3x+1\right)
Rewrite the complete factored expression.