# How do you write the radical expression of a^(4/9)?

${a}^{\frac{4}{9}} = \sqrt[9]{{a}^{4}}$
${a}^{\frac{4}{9}} = {a}^{4 \cdot \frac{1}{9}} = {\left({a}^{4}\right)}^{\frac{1}{9}} = \sqrt[9]{{a}^{4}}$
using ${a}^{b \cdot c} = {\left({a}^{b}\right)}^{c}$ and ${a}^{\frac{1}{n}} = \sqrt[n]{a}$