Question

List the value of the variable(s) for which the rational expression is undefined.

(a + 2)/ab

Answer 1

Question is

\[\frac{ a+2 }{ ab }\]

Answer 2

hope you know a fraction when is undefined ,yes ?

so when the denominator is equal zero

so in this case make

ab=0

so the answer when a=0 or b=0 the rational expression will be undefined