Since is undefined, I used L'Hopital's Rule twice to get
This gives an indeterminate case as well. So I used L'Hopital's Rule once again to get
which brings be back to an indeterminate case because of the x+5 in the denominator irregardless of how many times I take the derivative.
I know that , but don't know how to apply it here.
Graphing it on my calculator, I see that the limit goes to positive infinity.