Limits

Apr 2010
3
0
Hey guys! I was out of school due to AP exams and have missed three days of Pre-Calc, I'm just working through a thick packet of makeup work on Limits and Discontinuities right now and have been managing fine until I got to this problem:

lim (√x^2+9) - 3 / x^2
x→0

I know I'm not supposed to just plug in 0 for x, and that I have to do something on the top, but whatever that is, I'm just at a loss.

Any help will be greatly appreciated!
 
May 2009
959
362
multiply the numerator and the denominator by \(\displaystyle \sqrt{x^{2}+9} +3 \)