Question #102897
Solve the differential equation x^3 p^2 +x^2 yp+a^3=0 and also obtain its singular solution, if
it exists.
1
Expert's answer
2020-02-17T10:08:43-0500

x3p2+x2yp+a3=0x^3 p^2 +x^2 yp+a^3=0 ---(1) is the given differential equation, where p=dy/dxp=dy/dx

    y=xpa3/(x2p)\implies y=-xp-a^3/(x^2p)

Differentiating with respect to x, we get;

p=pxdp/dx+a3/x2p2(dp/dx)+2a3/x3pp=-p-xdp/dx+a^3/x^2p^2(dp/dx)+2a^3/x^3p

    2p+xdp/dx=2a3/px3+a3/x3p2(dp/dx)\implies 2p+xdp/dx=2a^3/px^3+a^3/x^3p^2(dp/dx)

    2p(1a3/x3p2)+xdp/dx(1a3/x3p2)=0\implies 2p(1-a^3/x^3p^2)+xdp/dx(1-a^3/x^3p^2)=0

    2p+xdp/dx=0\implies 2p+xdp/dx=0

    dp/p=2dx/x\implies\int dp/p=-2\int dx/x

    px2=c    p=c/x2\implies px^2=c \implies p=c/x^2 ---(2)

Substituting (2) in (1), we get;

c2+xyc+a3x=0c^2+xyc+a^3x=0 which is a quadratic equation in c;

Equating it's discriminant to 0, we get;

x2y24a3x=0x^2y^2-4a^3x=0

    x(xy24a3)=0\implies x(xy^2-4a^3)=0

    x=0andxy24a3=0\implies x=0 andxy^2-4a^3=0

Both these satisfy (1).

Thus, x=0x=0 and xy24a3=0xy^2-4a^3=0 are the singular solutions of the given differential equation.


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