# What are the excluded values and how do you simplify the rational expression (2r-12)/(r^2-36)?

##### 1 Answer
Nov 1, 2017

If we factor, we see

$\frac{2 \left(r - 6\right)}{\left(r - 6\right) \left(r + 6\right)}$

$\frac{2}{r + 6}$

We cannot have $r = \pm 6$ because it would make the expression undefined.

Hopefully this helps!