# Suppose f(1) = 2, f '(1) = 3 and f '(2) =4, then f^-1(2)=?

## Homework Statement

Suppose f(1) = 2, f '(1) = 3 and f '(2) =4, then f^-1(2)=?

## Homework Equations

I dont even know what eqn to use

## The Attempt at a Solution

Knowing that I dont know what eqn to use, how do i solve this
just plseas give me direct steps on how to answer it..

## Answers and Replies

D H
Staff Emeritus
You don't need the derivatives to solve this problem. Presumably those are for another part of the problem.

Hint: What is $f^{-1}(f(x))$?

HallsofIvy
Homework Helper
You need to learn the definition of $f^{-1}(x)$.

epenguin
Homework Helper
Gold Member
Is this all the problem?

There appears to be redundant, or rather irrelevant, information there.