Respuesta :

If a function is a one-to-one relation, then it is invertible. We have

[tex]f(x) = y \iff f^{-1}(y)=x[/tex]

So, given

[tex]f(3)=2,\quad f(-4)=8[/tex]

we can deduce

[tex]f^{-1}(2)=3,\quad f^{-1}(8)=-4[/tex]