Incorrect. Use the rules of exponents: $\displaystyle{{\left({{x}}^{{n}}\right)}}^{{m}}={{x}}^{{{n}{m}}}\usepackage{cmbright}\Huge\$ , $\displaystyle{{x}}^{{n}}{{x}}^{{m}}={{x}}^{{{n}+{m}}}\usepackage{cmbright}\Huge\$ , and $\displaystyle{\sqrt[{{r}}]{{{{x}}^{{k}}}}}={{x}}^{{\frac{{k}}{{r}}}}\usepackage{cmbright}\Huge\$ .