Incorrect. To simplify this expression, work from the inside out. Start by simplifying the expression $\displaystyle{{\left({{x}}^{{-{{2}}}}{{y}}^{{4}}\right)}}^{{-{{3}}}}\usepackage{cmbright}\Huge\$ first, then multiply it by $\displaystyle{{x}}^{{2}}{{y}}^{{-{{4}}}}\usepackage{cmbright}\Huge\$ , and then square that entire quantity. Remember 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\$ .