# I need some help.

1. Feb 13, 2006

### ludi_srbin

The problem says that if y=e^nx, then d^ny/dx^n=?

I got that the result is n^2e^nx, but it is not among the offered choices. Can someone tell what did I mess up? Thanks.

2. Feb 13, 2006

### Poop-Loops

You're not differentiating twice, like you did ($$n^{2}e^{nx}$$), but "n" number of times.

3. Feb 13, 2006

### ludi_srbin

Oh I see. I guess I shouldn't have assumed that it is a second derivative. Thanks for the help.

4. Feb 14, 2006

### HallsofIvy

Staff Emeritus
Yes, in general it is a mistake to assume something when you are told differently!