For your purposes, it is probably most effective to just graph the function and notice what happens as you approach the point x=3 from the left and right sides.
By the way, is perfectly valid. It's not an indeterminate form. However, it *is* a borderline case. i.e., if you went any smaller than 0, then a problem arises. This is definitely related to the problem.
You are asked to determine
As said in a previous post, you should probably just graph the function and see what happens as from the left...
For part b)
Note that this function is only defined for
How can you make approach from the right if the function is not defined for any values of to the right of ?
c) Limits only exist when the left hand limit and right hand limit are equal.
Since there is a left hand limit but NOT a right hand limit, what does that tell you about the limit of this function?