Answer
$3(1-3x)(1+3x)$
Work Step by Step
The polynomial $1-(3x)^2$ is a difference of the two squares $(3x)^2$ and $1^2$. That is, by using the fact that $a^2-b^2=(a-b)(a+b)$, we have
$$
3-27x^2=3(1-(3x)^2)=3(1-3x)(1+3x)
.$$
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