You may have combined the terms in the numerator by subtracting the coefficients and adding the exponents and then dividing that result by the denominator. To divide a polynomial by a monomial, divide each term separately by the denominator. The correct answer is $\displaystyle-{8}{{a}}^{{2}}{{b}}^{{2}}+{2}{{a}}^{{2}}{b}\usepackage{cmbright}\Huge\$ .