How do you find vertical asymptotes using limits? Calculus Limits Infinite Limits and Vertical Asymptotes 1 Answer Wataru Aug 30, 2014 The vertical line #x=a# is a vertical asymptote of $f(x)$ if either #lim_{x to a^-}f(x)=pm infty# or #lim_{x to a^+}f(x)=pm infty#. So, we need to find #a#-values such that either the left-hand limit or the right-hand limit is #pm infty#. Answer link Related questions How do you show that a function has a vertical asymptote? What kind of functions have vertical asymptotes? How do you find a vertical asymptote for y = sec(x)? How do you find a vertical asymptote for y = cot(x)? How do you find a vertical asymptote for y = csc(x)? How do you find a vertical asymptote for f(x) = tan(x)? How do you find a vertical asymptote for a rational function? How do you find a vertical asymptote for f(x) = ln(x)? What is a Vertical Asymptote? How do you find the vertical asymptote of a logarithmic function? See all questions in Infinite Limits and Vertical Asymptotes Impact of this question 6917 views around the world You can reuse this answer Creative Commons License