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Grade 12th passDifferential Calculus

Solve xdy- ydx= xy²dx please solve this one and and allow users to question below 50 characters …..........

Profile image of suraj attamwad
9 Years agoGrade 12th pass
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2 Answers

Profile image of Nathan Jacob
9 Years ago
xdy=ydx + x2y2/2 – C
 
On integration we get
xy=yx + x2y2/2
Therefore x2y2/2=C so either x2y2 is a constant value which also means xy is constant. I hope this was what you wanted. :)
Profile image of Jitender K Yadav
9 Years ago
I do not agree.
The correct answer is:-
x^{2}y+2Cy+2x=0
This is solved as:-
xdy-ydx=x2d(y/x)
Therefore,
x2d(y/x)=xy2dx
or
\frac{d(y/x)}{(\frac{y^{2}}{x^{2}})}=xdx
z-2dz=xdx       [Where z=y/x]
On integration,
\frac{-1}{z}=\frac{x^{2}}{2}+C
On putting z=y/x
\frac{-x}{y}=\frac{x^{2}}{2}+C
Simplifying
x^{2}y+2Cy+2x=0

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