



 
Hi, I assume you are to simplify this expression. I can help get you started. When you see an expression with a root in the denominator such as $\large \frac{15}{\sqrt5},$ you can try this \[\frac{15}{\sqrt5} = \frac{15 \sqrt 5}{\sqrt 5 \sqrt 5} = \frac{15 \sqrt{5}} {5} = 3 \sqrt{5}.\] I hope this helps, 



Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences. 