Incorrect. Remember that $\displaystyle{\left({5}{y}+{11}\right)}{\left({5}{y}-{11}\right)}\usepackage{cmbright}\Huge\$ can be rewritten as $\displaystyle{5}{y}{\left({5}{y}-{11}\right)}+{11}{\left({5}{y}-{11}\right)}\usepackage{cmbright}\Huge\$ . Watch for any terms that cancel.