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TS EAMCET · Maths · Differential Equations

If y=fx is the solution of the differential equation xdydx=x2+3y, x>0, y2=4, then f4=?

  1. A 48
  2. B 260
  3. C 80
  4. D 36
Verified Solution

Answer & Solution

Correct Answer

(A) 48

Step-by-step Solution

Detailed explanation

∵xdydx=x2+3y ⇒dydx−3x⋅y=x I.F=e∫−3xdx=e−3lnx=elnx−3=x−3 ∴The general solution is y⋅1x3=∫x⋅1x3dx ⇒yx3=−1x+c given, y(2)=4 ∴48=−12+c⇒c=1 ∴yx3=−1x+1…