## Introductory Algebra for College Students (7th Edition)

$\frac{1}{3}$
RECALL: (i) $a^{\frac{1}{2}}=\sqrt{a}$ (ii) $\sqrt{a^2}=|a|$ Use rule (i) above to obtain: $=\sqrt{\frac{1}{9}}$ Write $\frac{1}{9}$ as $(\frac{1}{3^2})$: $=\sqrt{(\frac{1}{3})^2}$ Use rule (ii) above to obtain: $=|\frac{1}{3}| \\=\frac{1}{3}$