EXACT equation !! hi!! to all I want little help about exact equation.. that the given equation is >> ay dx + bx dy= 0 I had solved and found integrating factor of all of my equations by formula P(x) = My-Nx/N but for this equation I have got IF for this equation is x((a-b)/b) and after multiplying this factor by equation I cant get exact equation once again and in book answers IF for this equation is x^a-1.y^b-1 So., can any one tell me how can I solve this eq by method of inspection >> plzzz help me!!