Question 148806
You're almost there.

You were asked to solve {{{(2x)/(x^2-1)}}} when x=0
You correctly substituted 0 for x everywhere

{{{(2*0)/(0^2-1)}}}

All you have to do now is the arithmetic. You done all the algebra.
{{{0/(0-1)}}}
{{{0/-1}}}
{{{0}}}

So f(0) = 0