## Algebra: A Combined Approach (4th Edition)

$-\dfrac{1}{4}$
$\dfrac{z}{z^{2}-5};$ $z=-5$ Replace $z$ with $-5$ and evaluate the operations: $\dfrac{-5}{(-5)^{2}-5}=\dfrac{-5}{25-5}=\dfrac{-5}{20}=-\dfrac{1}{4}$