1st O.D.E, homogenous but with constants

  • Thread starter Thread starter niceperson
  • Start date Start date
  • Tags Tags
    Constants
niceperson
Messages
5
Reaction score
0

Homework Statement



solve: y'=(x+y-1)/(x-y-2) i.e

Homework Equations





The Attempt at a Solution



let y=vx
thus
y'=v'x+v

by substitution:

v'x+v=(1+y/x-1/x)/(1-y/x-2/x)=(1+v-1/x)/(1-v-2/x)

v'x=(1-1/x+v^2+2v/x)/(1-v-2/x)

still can't separate the variables...any ideas?

thanksx
 
Physics news on Phys.org
thanks dick does work!
 
Uh, are you sure? I tried it again after I posted, and realized I'd made a mistake and deleted the post so it wouldn't confuse anyone. Just double check, ok?
 
Last edited:
There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...
Back
Top