If it were me, I would work first within the parentheses using:
$\displaystyle \sqrt[n]{x^m}=x^{\frac{m}{n}}$
Next, use the rule for exponents:
$\displaystyle a^b\cdot a^c=a^{b+c}$
Then finally use the rule for exponents:
$\displaystyle \left(a^b \right)^c=a^{bc}$