Question 450742
Find all numbers for which the rational expression is undefined:
m^3 - 4m
--------
m^2 - 81 
:
Yes, just do that
m^2 - 81 = 0
m^2 = 81
m = +/-{{{sqrt(81)}}}
m = 9
and
m = -9
:
undefined when m = 9 and m = -9