Answer
$x^{-\frac{3}{5}}$
Work Step by Step
RECALL:
(i) $a^{-m} = \dfrac{1}{a^m}$
(ii) $\sqrt[n]{a^m} = a^{\frac{m}{n}}$
Use rule (ii) above to obtain:
$=\dfrac{1}{x^{\frac{3}{5}}}$
Use rule (i) above to to obtain:
$=x^{-\frac{3}{5}}$