Incorrect. Substitute $\displaystyle-{2}\usepackage{cmbright}\Huge\$ for x in the function to get $\displaystyle{a}{\left(-{2}\right)}={3}{{\left(-{2}\right)}}^{{2}}-{6}\usepackage{cmbright}\Huge\$ and simplify the expression to find $\displaystyle{a}{\left(-{2}\right)}\usepackage{cmbright}\Huge\$ . The correct answer is 6.