You can put this solution on YOUR website! Under what conditions is undefined?
Anywhere the denominator=0 this is undefined.
Factor the denominator:
set each parenthesis=0 and solve for d, thase are the numbers that make this undefined.
d+1=0
d=-1
and
d+2=0
d=-2
and
d-2=0
d=2
This is undefined at d={-2,-1,2}
Happy Calculating!!!