Question

( f(x)=frac{x-1}{x+1} )
( f(f(x))=frac{frac{x-1}{x+1}-1}{frac{x+1}{x+1}+1}=frac{(x-1)-(x+1)}{x-1+x+1} )
[
=frac{-2}{2 x}=frac{1}{x} text { frose }
]

# X - 1. If f(x) = ** then find f{f(x)} x + 1

Solution

Instasolv

Solution