Question #179821

(2xz-yz)dx+(2yz-zx)dy-(x2-zx+y2)dz=0


1
Expert's answer
2021-04-13T23:31:14-0400

We have given the differential equation,

(2xzyz)dx+(2yzzx)dy(x2zx+y2)dz=0(2xz-yz)dx+(2yz-zx)dy-(x^2-zx+y^2)dz=0

This equation can be solved using the Pfaffian method,


Firstly we have to check whether the given differential equation is integrable or not.


Compare it with Pdx+Qdy+Rdz=0Pdx+Qdy+Rdz = 0

We get,

P=(2xzyz)P = (2xz-yz)

Q=(2yzxz)Q = (2yz-xz)

R=(x2zx+y2)R = -(x^2-zx+y^2)


Now, P(δQδzδRδy)+Q(δRδxδPδz)+R(δPδyδQδx)=0P(\dfrac{\delta Q}{\delta z}-\dfrac{\delta R}{\delta y})+Q(\dfrac{\delta R}{\delta x}-\dfrac{\delta P}{\delta z})+R(\dfrac{\delta P}{\delta y}-\dfrac{\delta Q}{\delta x}) =0


After putting values we get P(δQδzδRδy)+Q(δRδxδPδz)+R(δPδyδQδx)=0P(\dfrac{\delta Q}{\delta z}-\dfrac{\delta R}{\delta y})+Q(\dfrac{\delta R}{\delta x}-\dfrac{\delta P}{\delta z})+R(\dfrac{\delta P}{\delta y}-\dfrac{\delta Q}{\delta x}) =0


Hence the given differential equation is integrable.

Now to find the solution of the differential equation consider 'z' as constant then dz=0dz =0


Hence, Pdx+Qdy=0Pdx+Qdy =0

then,

(2xzyz)dx+(2yzxz)dy=0(2xz-yz)dx+(2yz-xz)dy =0

which is a exact differential equation whose solution can be given as


x2zxyz+y2z=Cx^2z-xyz + y^2z = C

which is of the form u(x,y,z)=Cu(x,y,z) = C


Hence, u(x,y,z)=x2zxyz+y2zu(x,y,z) = x^2z-xyz + y^2z  

Now, we are introducing two variables μ\mu and kk

whose values can be calculates as


μ=1Pδuδx\mu = \dfrac{1}{P}\dfrac{\delta u}{\delta x}


=1(2xzyz)2xzyz= \dfrac{1}{(2xz-yz)}{2xz-yz}{}


=1=1

and, k=μRδuδzk = \mu R - \dfrac{\delta u}{\delta z}


k=x2zx+y2x2xy+y2k = x^2-zx+y^2-x^2-xy+y^2

k=xyzxk = -xy-zx

k=x(y+z)k = -x(y+z)

Solution of differential equation can be find out by solving the differential equation,

δuδz+k=C\dfrac{\delta u}{\delta z}+k = C


x2xy+y2x(y+z)=Cx^2-xy + y^2-x(y+z) = C


This is the solution of the given differential equation.



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