Ok need to find the inverse and i need to show that

f ^(-1) o f= x= f o f^(-1)

p(x) =

x

-----

x - 1

i did

y=

x

---

y -1 = (y-1) x = y then xy -1x = y -xy

then

-1x = y(-x)

----- -------

-x -x

which means x = y ?

then i guess i need to find the inverse of that? i dont get it?

the inverse of x =y is y=x ?? i'm lost???