Correct. Substitute 2 for x in the function: $\displaystyle{g{{\left({2}\right)}}}=-{6}{\left({2}\right)}+{8}\usepackage{cmbright}\Huge\$

Simplify the expression: $\displaystyle{g{{\left({2}\right)}}}=-{12}+{8}=-{4}\usepackage{cmbright}\Huge\$