Correct. Evaluate the function $\displaystyle{f{{\left({x}\right)}}}={4}{x}-{1}\usepackage{cmbright}\Huge\$ for the input $\displaystyle{x}={2}\usepackage{cmbright}\Huge\$ to find the output, $\displaystyle{f{{\left({2}\right)}}}\usepackage{cmbright}\Huge\$ .

$\displaystyle{f{{\left({2}\right)}}}={4}{\left({2}\right)}-{1}={8}-{1}={7}\usepackage{cmbright}\Huge\$