- #1
Akash47
- 53
- 5
- Homework Statement
- If x, a, b are positive integers, f(x) is positive integer too. And if a>b, then
f(a)>f(b).What is f(6)?
- Relevant Equations
- f(f(x))= x^2+2
It is obvious that the function f is not injective. From the given equation, we get f(f(2))=6.And since,there is an inequality given in the problem, I think we can use that to find f(6).But I have got stuck here and can't move.Do I have to find what is f(x) first?Then how?