Simplify the expression.

$\sqrt[\phantom{2}]{75x^8}+\sqrt[\phantom{2}]{48x^8}$

Enter the exact answer.

Hints:

You can write exponents with the ${?}^{{?}^{?}}$ symbol, for example writing $x^8$ as $x^{{?}^{{?}^{?}}}8$

You can write square roots as sqrt$,$ for example writing $\sqrt[\phantom{2}]{75x^8}$ as $\sqrt[\phantom{2}]{75x^{{?}^{{?}^{?}}}8}$