Answer
$3(x+3)^2$
Work Step by Step
Consider the polynomial $3x^2+18x+27$
Take out common term, that is, $3$.
$\implies 3(x^2+6x+9)$
or, $=3(x^2+6x+3^2)$
or,$=3(x+3)(x+3)$
Hence, $3x^2+18x+27=3(x+3)^2$
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