Answer
$3x\sqrt {2y}$
Work Step by Step
$\sqrt {3xy}\times\sqrt {6x}$
=$\sqrt {3xy\times6x}$
=$\sqrt {2\times9\times x^{2}\times y}$
=$\sqrt {2\times3^{2}\times x^{2}\times y}$
=$3x\sqrt {2y}$
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