Let y = y ( x ) be the solution of the differential equation x log e x d y d x + y = x 2 log e x , ( x >…

Let y=y(x)  be the solution of the differential equation xlogexdydx+y=x2logex,(x>1). If y(2)=2, then y(e) is equal to
  1. 4+e24
  2. 1+e24
  3. 2+e22
  4. 1+e22

Solution

Given,

xlnxdydx+y=x2lnx

dydx+yxlnx=x

This is a linear differential equation.

Now, finding integrating factor we get

I.F=e1xlnxdx=elnlnx=lnx

Now, solution of the differential equation is given by

y×I.F=x×I.Fdx

y×lnx=xlnx dx

y×lnx=lnx·x22-x24+c

Now given y2=2,

2×ln2=ln2·222-224+c

c=1

So, equation will be y×lnx=lnx·x22-x24+1

Now finding ye we get,

y×lne=lne·e22-e24+1

y×1=1·e22-e24+1

y=4+e24

Asked in: JEE Main 2023 (29 Jan Shift 2)

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