Are there instances in an unseparable differential equation where after using substitution, the variables are still not separable?  ?

If yes, is it ok to integrate?

I'm new to this so I have a lot of questions, pls pardon me if my question is kinda dumb.

1 Answer

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  • Ian H
    Lv 7
    2 months ago

    Yes, there are many DEs that are non-separable

    This type of first order linear differential equation is usually non-separable

    dy/dx + P(x)y = Q(x)

    but fortunately it has a solution given by

    I(x)*y = ∫ [I(x)Q(x)] dx

    where I = e^ ∫P(x) dx is called the INTEGRATING FACTOR

    Justification of this method with several worked examples at this link.

    http://www.cse.salford.ac.uk/physics/gsmcdonald/H-...

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