Try this option: if [tex]f(x)= \frac{x+2}{4x+4} [/tex] then according to [tex] \lim_{x \to (-1-0)} ( \frac{x+2}{4x+4})=+ \infty[/tex] and [tex]\lim_{x \to (-1+0)} ( \frac{x+2}{4x+4})=- \infty[/tex] an equation for vertical asymptote is x=-1. The graph of this function is in the attached picture.
