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MHT CET202525 Apr 2025Morning ShiftMathematicsDifferential EquationsActual

y = e ^x( ~A x+ B x) is the solution of the differential equation

Options

  1. Ax^2 ~d ^2 y d x^2 + (1+ y ^2 )=0
  2. Bd ^2 y d x^2 - dy d x + y =0
  3. Cd ^2 y d x^2 -2 dy d x +2 y =0
  4. Dx ~d ^2 y d x^2 -2 dy d x +2 y =0

Correct answer

C. d ^2 y d x^2 -2 dy d x +2 y =0

Step-by-step solution

The differential equation for y = e^x(A x + B x) can be found by differentiating twice to eliminate the arbitrary constants A and B . Differentiating y with respect to x : dy dx = e^x(A x + B x) + e^x(-A x + B x) = y + e^x(-A x + B x) Differentiating again: d^2y dx^2 = dy dx + d dx [e^x(-A x + B x)] Applying the product rule: d^2y dx^2 = dy dx + e^x(-A x + B x) + e^x(-A x - B x) Substituting e^x(-A x + B x) = dy dx - y and e^x(-A x - B x) = -y : d^2y dx^2 = dy dx + ( dy dx - y) - y = 2 dy dx - 2y The resulting diff

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