It appears that you did not realize that the dividend did not have an $\displaystyle{{x}}^{{2}}\usepackage{cmbright}\Huge\$ term, and treated $\displaystyle-{9}{x}\usepackage{cmbright}\Huge\$ as if it were $\displaystyle-{9}{{x}}^{{2}}\usepackage{cmbright}\Huge\$ . When you set up a long division, first check to see if the dividend has any missing terms and put in a placeholder. In this case, the placeholder would be $\displaystyle{0}{{x}}^{{2}}\usepackage{cmbright}\Huge\$ .