Calculus question! Limits and infinity.?

[DarianC]

So, when i have a factored out function and i'm trying to find a limit (for example, as x approaches 0), and the function turns out to be let's say 8/0, I know that the limit approaches infinity, but how can i tell if it's positive infinity or negative infinity (in that case the limit DNE). But how can i tell from approaching each side whether it is a pos or neg infinity?
Thanks

 

[bskelkar]

I suggest, you revise limits again [and again and again] if you are getting the "answer" as 8/0.
Lot of understanding is still required.
What type of function is it? Polynomial or exponential or trigonometric or logarithmic? A lot depends on that.
Can you reword this to a better one?

 

[JulzB]

if it is approaching from the left, its from negative infinity. from the right, positive. if the curve goes up, its positive. if the curve goes down, positive.