Answer
$-\frac{28x^2\sqrt x}{3}$
Work Step by Step
$-2\sqrt 7x^2.\frac{1}{3}\sqrt 28x^3$
$=-\frac{2}{3}\sqrt 196x^5$
$=-\frac{2}{3}.14x^2\sqrt x$
$=-\frac{28x^2\sqrt x}{3}$
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