Incorrect. There are only two $\displaystyle{{c}}^{{2}}{b}\usepackage{cmbright}\Huge\$ terms in these polynomials, $\displaystyle-{8}{{c}}^{{2}}{b}\usepackage{cmbright}\Huge\$ and $\displaystyle{10}{{c}}^{{2}}{b}\usepackage{cmbright}\Huge\$ . Combine these two like terms. The other terms cannot be combined with these terms. The correct answer is 2.