Answer to Question #236283 in Chemical Engineering for Lokika

Question #236283

Find the complete integral of the PDE px+qy+z=xq²

Explain the problem with step by step process?


1
Expert's answer
2021-09-25T11:46:13-0400

The provided equation is: PDE px+qy+z=xq²px+qy+z=xq²

We can use Charpit's auxiliary equations to get: 

ds=dp0=dq0=dzz+pq=dxx+q=dyy+pds=dp0,dp0=dq0    p=C,q=Dds= \frac{dp}{0}= \frac{dq}{0}=\frac{dz}{z+pq}=\frac{dx}{x+q} =\frac{dy}{y+p}\\ ds=\frac{dp}{0}, \frac{dp}{0}=\frac{dq}{0} \implies p=C, q=D

We get a complete integral of: 

dz=pdx+qdy=Cdx+Ddyz(x,y)=Cx+Dy+Edz = pdx + qdy = Cdx + Ddy \\ z(x,y) = Cx + Dy + E



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