## Geometry: Common Core (15th Edition)

$\sqrt {2}$
First, we write both numbers in the numerator under the same radical: $\frac{\sqrt {6} • \sqrt {3}}{\sqrt {9}} = \sqrt {\frac{6 • 3}{9}}$ Multiply what is under the radical sign first: $\sqrt {\frac{18}{9}}$ Divide both the numerator and denominator by their greatest common denominator, $9$: $\sqrt {2}$