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Black Book Advanced Problems in MathematicsMathematicsQuadratic Equation

If two roots of x^3 - ax^2 + bx - c = 0 are equal in magnitude but opposite in sign. Then:

Options

  1. Aa+bc = 0
  2. Ba^2 = bc
  3. Cab = c
  4. Da-b+c=0 .

Correct answer

C. ab = c

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