## Help with a differential equation

Hello everybody,
I need to solve this differential equation:

I have splitted the study in two parts:
- When n=1 and it's linear, then it has analytic solution. I have done some work about it (see here: FreeImageHosting.net Hosting Service ), but I need to finish it.

- When n>1 and it's not linear, then I have to solve it using numerical methods (like Euler or Runge-Kutta). I should solve it using any maths software, better with Matlab. The study consists of analyze the function behavior depending of the different values of constants and parameters.

I would be very very grateful if somebody could help me to solve the problem.

Lots of thanks.