Answer
$2x\sqrt3$
Work Step by Step
$\sqrt 12x^{2}=\sqrt(4x^{2}\times3)=\sqrt (4x^{2})\times\sqrt3=2x\sqrt3$
We know that $\sqrt(4x^{2})=2x$, because $(2x)^{2}=2^{2}x^{2}=4x^{2}$.
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