- #1

- 103

- 4

## Homework Statement

Suppose ##f(x) = x^5 + 2x + 1## and ##f^{-1}## is the inverse of function f. Evaluate ##f^{-1}(4)##

solution: 1/7

## Homework Equations

##(f^{-1}(x))=\frac{1}{f'(f^{-1}(x))}##

## The Attempt at a Solution

I attempted to use my calculator's solve function to get the solution of ##4 = 5x^4 + 2##, so the value of x when the derivative is equal to 4. I then took the inverse of this. Sort of still grasping in the dark right now tho.