- #1
manenbu
- 103
- 0
So there's this equation:
[tex]x^2 y^2 dx + (x^3y-1)dy[/tex]
It has to be solved with the integrating factor method, so I get this:
[tex]\mu(y) = e^{\int \frac{dy}{y}} = e^{\ln{|y|}} = |y|[/tex]
My question is, what do I do with the absolute value bars?
If I just drop them and multiply the entire equation with y, then I can solve the equation and get:
[tex]2x^3 y^3 - 3 y^2 = C[/tex]
Which is the correct answer.
But I'm not sure that dropping it will always be correct, so what should be done here?
[tex]x^2 y^2 dx + (x^3y-1)dy[/tex]
It has to be solved with the integrating factor method, so I get this:
[tex]\mu(y) = e^{\int \frac{dy}{y}} = e^{\ln{|y|}} = |y|[/tex]
My question is, what do I do with the absolute value bars?
If I just drop them and multiply the entire equation with y, then I can solve the equation and get:
[tex]2x^3 y^3 - 3 y^2 = C[/tex]
Which is the correct answer.
But I'm not sure that dropping it will always be correct, so what should be done here?