Question

Simplify the following rational expression.

Answer 1

Answer:

z=-8 and z=8

Step-by-step explanation:

A rational expression  is undefined when its denominator is equal to zero, so our expression is undefined when $z^2-64=0$. Solving for z, we get

$z^2=64\\\sqrt{z^2}=\pm\sqrt{64}\\ z=\pm8$