Question

whats the vertical asymptote of
f(x)=(2x-1)/(x^2+2x-3)

Answer 1

Vertical asymptotes are vertical lines which correspond to the zeroes of the denominator of a rational function.
see: http://www.purplemath.com/modules/asymtote.htm

so, you need to solve: x^2 +2x-3=0
it will give you your asymptote(s)