Answer
$ 3x^{2}(x+1 )^{2}$
Work Step by Step
Factor out the largest common factor, $3\mathrm{x}^{2}$,
$=3x^{2}(x^{2}+2x+1)$
recognize a perfect square, $(a+b)^{2}=a^{2}+2ab+b^{2}$
$= 3x^{2}(x+1 )^{2}$
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