Differential Equations · Class 12 · CBSE · Science Mathematics

The solution of the differential equation dy/dx = 2xy satisfying y(0) = 3 is:

Practice question from Differential Equations (Class 12 · CBSE · Science Mathematics), with the correct answer and a step-by-step solution.

easy · MCQ · Q-DBE80D

The solution of the differential equation dy/dx = 2xy satisfying y(0) = 3 is:

  1. A.y = 3e^(x²)Correct answer
  2. B.y = 3e^(2x)
  3. C.y = 3x²
  4. D.y = e^(3x²)

Solution

Separating variables gives dyy=2x dx\frac{dy}{y}=2x\,dx. Hence ln⁡y=x2+C\ln y=x^2+C, so y=Cex2y=Ce^{x^2}; using y(0)=3y(0)=3 gives y=3ex2y=3e^{x^2}.

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