Answer
$\sqrt[3] {\frac{27}{x^2}}$
Work Step by Step
$3x^{-\frac{2}{3}}=3^1(\frac{1}{x})^{\frac{2}{3}}=3^{\frac{3}{3}}\sqrt[3] {\frac{1^2}{x^2}}=\sqrt[3] {3^3}\sqrt[3] {\frac{1}{x^2}}=\sqrt[3] {27\frac{1}{x^2}}=\sqrt[3] {\frac{27}{x^2}}$
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