# Chain rule Derivative help

1. Nov 12, 2006

### thomasrules

Given: $$h=f\circ g , g(2)=5, g\prime(2)=3$$, and $$f\prime(5)=-2$$
Determine $$h\prime(2)$$

Last edited: Nov 12, 2006
2. Nov 12, 2006

Use the fact that (f o g) ' (x) = f ' (g(x)) * g ' (x).

3. Nov 12, 2006

### thomasrules

i dont get it

4. Nov 12, 2006

It's right in front of you, think about it.

5. Nov 12, 2006

### dontdisturbmycircles

The Chain rule states that given f(g(x)), the derivative f ' (g(x)) can be found by finding the derivative of f at g(x) multiplied by the derivative of g(x). Which is what radou pointed out.

Do we know f ' (g(x))? Think about what g(x) equals in this case. Do we know g ' (x)? Think!!! The chain rule is very important!

Last edited: Nov 12, 2006
6. Nov 12, 2006

### thomasrules

got it ty....