Incorrect. Substitute $\displaystyle-{2}\usepackage{cmbright}\Huge\$ for x: $\displaystyle-{{\left({7}{x}\right)}}^{{2}}=-{{\left({7}\cdot{\left(-{2}\right)}\right)}}^{{2}}\usepackage{cmbright}\Huge\$ . Make sure that you follow the correct order of operations.