Answer
$\sqrt (15yx)$
Work Step by Step
The product rule holds that $\sqrt[n] a\times\sqrt[n] b=\sqrt[n] (ab)$ (where $\sqrt[n] a$ and $\sqrt[n] b$ are real numbers).
Therefore, $\sqrt 3y\times\sqrt 5x=\sqrt (3y\times5x)=\sqrt (15yx)$
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