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COMEDK2023Morning ShiftMathematicsIndefinite IntegrationActual

x d x 2(1+x)^ 3 / 2 is equal to

Options

  1. Ax 1+x +C
  2. B2+x x 1+x +C
  3. C- x 1+x +C
  4. D2+x 1+x +C

Correct answer

D. 2+x 1+x +C

Step-by-step solution

Let I = x 2(1+x)^ 3/2 dx . Substitute u = 1+x , so du = dx and x = u-1 . Substituting these into the integral: I = 1 2 u-1 u^ 3/2 du = 1 2 (u^ -1/2 - u^ -3/2 ) du . Integrating with respect to u : I = 1 2 [ u^ 1/2 1/2 - u^ -1/2 -1/2 ] + C = 1 2 [2 u + 2 1 u ] + C = u + 1 u + C . Substituting u = 1+x back: I = 1+x + 1 1+x + C = 1+x+1 1+x + C = 2+x 1+x + C . Answer: 2+x 1+x +C

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