Answer
$2x \sqrt[3]{2x}$.
Work Step by Step
The given expression is
$=\sqrt[3]{16x^4}$
Factor as cube terms.
$=\sqrt[3]{8x^3\cdot 2x}$
Use product property of cube roots.
$=\sqrt[3]{8x^3}\cdot \sqrt[3]{2x}$
Use $8=2^3$.
$=\sqrt[3]{2^3x^3}\cdot \sqrt[3]{2x}$
Use product property of cube roots.
$=\sqrt[3]{2^3}\cdot \sqrt[3]{x^3}\cdot \sqrt[3]{2x}$
Simplify.
$=2x \sqrt[3]{2x}$.
