Incorrect. Polynomials in the form $\displaystyle{{a}}^{{2}}+{2}{a}{b}+{{b}}^{{2}}\usepackage{cmbright}\Huge\$ represent the square of a sum, and polynomials in the form $\displaystyle{{a}}^{{2}}-{2}{a}{b}+{{b}}^{{2}}\usepackage{cmbright}\Huge\$ represent the square of a difference. Remember that either a or b could be a squared term as well. For example, $\displaystyle{{\left({3}{{x}}^{{2}}-{1}\right)}}^{{2}}={9}{{x}}^{{4}}-{6}{{x}}^{{2}}+{1}\usepackage{cmbright}\Huge\$ .