I seem to be having some trouble grasping this concept. I want to know how I can tell if a limit exists by looking at a graph (cartesian plane) given specific points.
For instance I have the problem:
Given the points (0, -3) [its an open dot at this point] and (-2, -5) [a closed dot here] and y = h(x) determine the following limits (if they exist):
a. lim h(x)
x -> -2
b. lim h(x)
x -> 0
What math techniques can I use to approach a problem like this?
Thanks for any help.