# First order nonlinear

1. Mar 23, 2010

### bpcraig

Maybe I'm just dumb...

$$y'(t)=y(t)^3+f(t)$$

find $$y(t)$$

Thanks...

2. Apr 7, 2010

### Eynstone

Welcome bpcrai.
Try substituting z =1/y^2 if permissible. If the magnitude of z is large in the range, we can neglect a constant & separate the variables.

P.S. : I'm afraid everybody's dumb at solving nonlinear differential equations. ;)