# What are the excluded values for (k^2-4)/(k^2+5k-24)?

Mar 14, 2017

$k = - 8 , \mathmr{and} k = 3$
The denominator is a quadratic expression which can be factorised as $\left(k + 8\right) \left(k - 3\right)$.
At $k = - 8 \mathmr{and} k = 3$ one of the the factors would be equal to zero which would make the given rational expression undefined.