Incorrect. Try rewriting the problem in this form: $\displaystyle\frac{{1}}{{3}}{{a}}^{{3}}{\left({12}{{a}}^{{2}}+{9}{a}-{3}\right)}+{3}{{a}}^{{2}}{\left({12}{{a}}^{{2}}+{9}{a}-{3}\right)}\usepackage{cmbright}\Huge\$ . For each set of parentheses, distribute the term outside to each term in that polynomial, while keeping track of your exponents. Then simplify the expression by combining or canceling like terms. Does that help you to solve the problem?