Answer
$-15x^2\sqrt {2}$
Work Step by Step
$-3\sqrt {5x^3}*\sqrt {10x^3}$
$-3\sqrt {5x^2*x}*\sqrt {5*2x^2*x}$
$-3\sqrt {5x^2*x*5*2x^2*x}$
$-3*5\sqrt {x^2*x*2x^2*x}$
$-15x\sqrt {x*2*x}$
$-15x^2\sqrt {2}$
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