NCERT Example 17 - Relations and Functions

Question: Let f : N → Y, f(x) = 4x + 3, where Y = {y ∈ N : y = 4x + 3 for some x ∈ N}. Show f is invertible and find f⁻¹.

Answer: f is invertible with f⁻¹(y) = (y − 3)/4.

Full step-by-step NCERT solution with diagrams on Something by Zero.

All Chapter 1 solutions