# Calculus Problem

1. Jan 6, 2013

### dth257

Calculus Problem!!

need help with d

2. Jan 6, 2013

### SammyS

Staff Emeritus
Re: Calculus Problem!!

Hello dth257. Welcome to PF !

What is f '(x) ?

What is f-1(0) ?

Last edited: Jan 6, 2013
3. Jan 6, 2013

### dth257

Re: Calculus Problem!!

I'm sorry i dont know what you meant. Are you asking questions or showing me the way to do it?

4. Jan 6, 2013

### Ray Vickson

Re: Calculus Problem!!

Show your work. Forum rules require you to do some work on your own first, before seeking help.

5. Jan 6, 2013

### SammyS

Staff Emeritus
Re: Calculus Problem!!

You said you needed help with part (d), so I assumed you know how to do parts a, b, c .

6. Jan 6, 2013

### dth257

Re: Calculus Problem!!

I'm sorry for misunderstand.
a. f(1)= 0
b. f'(1)= sqrt(5)/5=.447214

7. Jan 6, 2013

### Dick

Re: Calculus Problem!!

Showing your work means not only giving the answers but trying to explain how you got them. What about c)? Once you've got that there is a formula for differentiating inverse functions. See http://en.wikipedia.org/wiki/Inverse_functions_and_differentiation Is that the part you are missing?

Last edited: Jan 6, 2013
8. Jan 7, 2013

### dth257

Re: Calculus Problem!!

I'm sorry i'm a newbie in here. I dont know how to type these mathematical equations in the forum. It would take me few hours to just type all of the work down.( that why i posted the picture instead of type them out) So i just gave out the answer. That's the fastest way i can do.

9. Jan 7, 2013

### Dick

Re: Calculus Problem!!

Fastest isn't best. Any thoughts about c)?