Complex numbers making finding limits more difficult. The conjugate method is an effective way to make radical expressions easier to deal with. I also deal with an example to make the subject more clear.
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This pencast was interesting and helpful with conceptually thinking about a limit, but seems unfinished. The discussion begins with finding a specific limit, but then goes off on a few tangents – all of which are applicable, but leave the discussion unfinished. I would strongly recommend watching part 2 right after watching part 1 to get the full discussion/explanation.