Answer
$16$
Work Step by Step
The given expression is
$=(-64)^{\frac{2}{3}}$
Rational exponents.
$=((-64)^{\frac{1}{3}})^2$
Use $64=4^3$.
$=((-4^3)^{\frac{1}{3}})^2$
Simplify.
$=(-4)^2$
$=16$.
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