## Precalculus (6th Edition) Blitzer

$2x\sqrt 3$
$\sqrt {12x^2}=\sqrt {12}\times\sqrt {x^2}=\sqrt {4\times3}\times\sqrt {x^2}=\sqrt 4\times\sqrt 3\times x=2\times\sqrt 3\times x= 2x\sqrt 3$
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