Incorrect. Be sure to distribute the negative sign in this expression. Recall that $\displaystyle-{\left({50}{{y}}^{{3}}{{q}}^{{2}}-{23}{p}{y}\right)}\usepackage{cmbright}\Huge\$ can also be written as $\displaystyle{\left(-{1}\right)}{\left({50}{{y}}^{{3}}{{q}}^{{2}}-{23}{p}{y}\right)}\usepackage{cmbright}\Huge\$ .