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Q.

The solution of x(x-1)dydx-(x-2) y=x3(2x-1) is

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a

y(x+1)x2=x2+x+c

b

y(x+1)x2=x2-x+c

c

y(x-1)x2=x2-x+c

d

y(x-1)x2=x2+x+c

answer is A.

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Detailed Solution

x(x-1)dydx-(x-2)y=x3(2x-1)

Divide by x(x-1)

dydx-(x-2)x(x-1)y=x3·(2x-1)x(x-1)

then y the form dydx+Py=Q

P=-(x-2)x(x-1)=2-xx(x-1)I.F=e2-xx(x-1)dx2-xx(x-1)=Ax+Bx-1  2-x x(x-1)=A(x-1)+Bx x(x-1)

 2-x=Ax-A+Bx  2-x=-A+x(A+B)  A=-2, A+B=-1  B=1

  2-xx(x-1)=-2x+1x-12-xx(x-1)=-2xdx+1x-1dx =-2log x+log(x-1)  log(x-1)-log x2  log(x-1)-log x2=log x-1x2I.F=elog x-1x2=x-1x2

multiply with x-1x2 and integrate B.S

y×x-1x2=x3(2x-1)x(x-1)×x-1x2 =2x dx- dxyx-1x2=x2-x+c

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