# Exact equation?

1. Jan 30, 2005

### Feynmanfan

Tough differential equation

Hello!

I'm having real trouble with this differential equation. I don't want you to solve it for me. Just give me a hint what I should do.

(1+7x+6y+3x^2+4xy+5y^2)dx+2(1+2x+5y)dy=0

Obviously it is not exact. But I'm trying to find an integrating factor..
May be I should use another technique.

Last edited: Jan 30, 2005
2. Jan 30, 2005

### Feynmanfan

It's a tough one isn't it?

3. Jan 30, 2005

### da_willem

I think it has no simple solution. Maple gave up after a while...

4. Jan 30, 2005

### Feynmanfan

well, I am suposed to know how to solve it. THat was last year's exam question!

5. Jan 30, 2005

### dextercioby

Do u at least know what u were supposed to to be doing??I mean the theory behind (non)exact ODE??

Daniel.

6. Jan 30, 2005

### Feynmanfan

I don't understand your question. I've been trying all techniques I learned (homogeneous, isobaric equation, exact equations, integrating factor,...). But I can't solve it.