Question 259315
Vertical asymptotes occur when the denominator equal zero.
{{{x^2-4=0}}}
{{{x=0 +- 2}}}
As x becomes larger the function looks like (1/x), so the horizontal asymptote is 
{{{y=0}}}
{{{ graph( 300, 300, -10, 10, -20, 20, (2x-2)/(x^2-4)
) }}}