Incorrect. The expression $\displaystyle{\left({{x}}^{{3}}{{y}}^{{5}}\right)}{\left({{y}}^{{2}}\right)}\usepackage{cmbright}\Huge\$ would have simplified to $\displaystyle{{x}}^{{3}}{{y}}^{{7}}\usepackage{cmbright}\Huge\$ . To simplify $\displaystyle{{\left({{x}}^{{3}}{{y}}^{{5}}\right)}}^{{2}}\usepackage{cmbright}\Huge\$ , you need to multiply the entire expression by itself.