Question

Let f(x)=x-1÷x+1 then f(f(x))is

Answer 1

Let's say f(x) = y y = x-1/x+1 = x+1 –1–1/x+1 =(x+1)-2/x+1 =1–2/x-1 => (y-1)(x-1)=-2 You can ... What is the value of f(x) if f(f(x)) =x²-x-1?