#### Answer

$-2x$

#### Work Step by Step

RECALL:
(i) $\sqrt[n]{a^n} = a$ when $n$ is odd
(ii) $\sqrt[n]{a^n}=|a|$ when $n$ is even
Write the expression inside the radical sign as a cube, and then use the rule (i) above to obtain:
$\sqrt[3]{(-2x)^3}=-2x$