Question

evaluate the limit as x approaches 9 of
(√r)/(r-9)^4

Answer 1

but there's r in the function, and not x.

Answer 2

and if r approaches 9
then just plug in r=9 and tell me what u get.

Answer 3

forgive me, I meant to say r approaches 9.

If you plug it in, you get a zero in the denominator.

Answer 4

You need to cancel something, don't you?

Answer 5

nopes, not here. there is no common factor in numerator or denominator.
3/0 = infinity
so your limit doesn't exist.

Answer 6

Thanks!

Answer 7

welcome :)