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Black Book Advanced Problems in MathematicsMathematicsQuadratic Equation

The complete set of values of a so that equation ^4 x + a ^2 x + 4 = 0 has at least one real root is :

Options

  1. A( , -5]
  2. B(- , 4] [4, )
  3. C(- , -4]
  4. D[4, ) .

Correct answer

A. ( , -5]

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