Incorrect. Substitute the values for x into the equation, to get $\displaystyle{{6}}^{{0}}\usepackage{cmbright}\Huge\$ , $\displaystyle{{6}}^{{1}}\usepackage{cmbright}\Huge\$ , $\displaystyle{{6}}^{{2}}\usepackage{cmbright}\Huge\$ , and $\displaystyle{{6}}^{{3}}\usepackage{cmbright}\Huge\$ . Simplify each of these.