# Math Help - Not sure how to rationalize the denominator

1. ## Not sure how to rationalize the denominator

Hi All,

Simplify the following expression

$
\dfrac
{
(b+c)^{\frac{-3}{8}} -
(b-c)^{\frac{-3}{8}}
}
{(b^2 - c^2)^{\frac{5}{8}}
}
$

I am unclear on how to proceed with this problem. Your help is much appreciated. Thanks.

2. Try multiplying top and bottom by $\displaystyle \left(b^2 - c^2\right)^{\frac{3}{8}}$.

3. Ah cool! I see. So Rationalizing here is to try to get the power of the denominator = 1. That works out, Thanks!