Question

find all values for which the rational expression is undefined: z minus 7 over z squared plus 5

Answer 1

\[Find all values for which the rational expression is undefined:\left[\begin{matrix}z - 7 \\ zsquared+ 5\end{matrix}\right]\]

Answer 2

Is the denominator z^2+5, if that's the case it won't be undefined because any number that you plug in for x it will give positive. In other words there's no number that will make the denominator equal zero