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Black Book Advanced Problems in MathematicsMathematicsApplication of Derivatives

If f(x) = a |x| + bx^2 + x has extremas at x = 1 and x = 3 , then :

Options

  1. Aa = 3 4 , b = - 1 8
  2. Ba = 3 4 , b = 1 8
  3. Ca = - 3 4 , b = - 1 8
  4. Da = - 3 4 , b = 1 8

Correct answer

C. a = - 3 4 , b = - 1 8

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