Incorrect. Be sure to use the exponent rules: $\displaystyle{{\left({{x}}^{{n}}\right)}}^{{m}}={{x}}^{{{n}{m}}}\usepackage{cmbright}\Huge\$ and $\displaystyle{{x}}^{{n}}{{x}}^{{m}}={{x}}^{{{n}+{m}}}\usepackage{cmbright}\Huge\$ and remember that $\displaystyle{{a}}^{{-{{n}}}}=\frac{{1}}{{{a}}^{{n}}}\usepackage{cmbright}\Huge\$ .