Neither the product nor the domain matches. $\displaystyle\frac{{{x}}^{{3}}}{{{x}-{1}}}\div\frac{{{x}-{1}}}{{{x}+{1}}}=\frac{{{{x}}^{{4}}+{{x}}^{{3}}}}{{{{x}}^{{2}}-{2}{x}+{1}}}\usepackage{cmbright}\Huge\$ . The domain of this expression is all $\displaystyle{x}\usepackage{cmbright}\Huge\$ , $\displaystyle{x}\ne{1}\usepackage{cmbright}\Huge\$ and -1.