Question

What is a Vertical Asymptote?

Answer 1

A vertical asymptote is a vertical line occurring at `x=c`, where `c` is some real number, if the limit of the function `f(x)` approaches `+-oo` as `x->c` from the left or the right (or from both).

For a more thorough explanation of vertical asymptotes, go here: http://socratic.org/questions/what-is-a-vertical-asymptote-in-calculus?