Incorrect. Recall that you can write $\displaystyle{{\left({y}-{4}\right)}}^{{-{2}}}\usepackage{cmbright}\Huge\$ as $\displaystyle\frac{{1}}{{{\left({y}-{4}\right)}}^{{2}}}\usepackage{cmbright}\Huge\$ . Which values for y will cause $\displaystyle{\left({{y}}^{{2}}-{9}\right)}{{\left({y}-{4}\right)}}^{{2}}\usepackage{cmbright}\Huge\$ to equal 0?