You may have divided $\displaystyle{{x}}^{{2}}\usepackage{cmbright}\Huge\$ by x, and $\displaystyle-{8}{x}\usepackage{cmbright}\Huge\$ by $\displaystyle-{8}\usepackage{cmbright}\Huge\$ . This is not the correct method for division of polynomials. Use the long division process taught in the text.