Respuesta :

Substitute a for x

[tex]-f\text{ (x ) = - f (a) = - }\frac{2a}{a-1}[/tex]

Determine - f(a) for f(x) =2x/x-1 and simplify.​

Thus, the solution becomes:

[tex]-\frac{2a}{a-1}\text{ or }\frac{2a}{1-a}[/tex]