The curve of the graph in question is too steep to represent this quadratic equation. If $\displaystyle{y}=-{2}{{x}}^{{2}}\usepackage{cmbright}\Huge\$ , then $\displaystyle{y}=-{32}\usepackage{cmbright}\Huge\$ when $\displaystyle{x}={4}\usepackage{cmbright}\Huge\$ . On the graph, however, $\displaystyle{y}=-{4}\usepackage{cmbright}\Huge\$ when $\displaystyle{x}={4}\usepackage{cmbright}\Huge\$ .