Incorrect. Use the laws of exponents to rewrite the expression: $\displaystyle{{243}}^{{\frac{{2}}{{5}}}}{{\left({{a}}^{{\frac{{5}}{{2}}}}\right)}}^{{\frac{{2}}{{5}}}}\usepackage{cmbright}\Huge\$

Factor 243 and rewrite as a number with an exponent. Use the laws of exponents to simplify by multiplying powers. The correct answer is 9a.