Answer
$36x^3\sqrt{10x}$
Work Step by Step
$$A=wl$$
$$A=\frac{36}{\sqrt3}\cdot \sqrt{30x^7}=\frac{36}{\sqrt3}\cdot \sqrt{3\cdot10\cdot x^6\cdot x}=\frac{36}{\sqrt3}\cdot \sqrt{3}\cdot\sqrt{ x^6}\cdot\sqrt{10 x}=36x^3\sqrt{10x}$$
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