Using limits how do I find vertical asymptotes

Question

How do I used limits to find the vertical asymptotes of f(x)= (2e^x)/((e^x)-5)

Answer 1

x=ln5 is the vertical asymptote here (the first candidates to be vertical points are the points that make denominator 0). So Iim_{x ->ln5+-} f(x)= +-\infty