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Black Book Advanced Problems in MathematicsMathematicsQuadratic Equation

Let r, s, t be the roots of the equation x^3 + ax^2 + bx + c = 0 , such that (rs)^2 + (st)^2 + (rt)^2 = b^2 - kac , then k =

Options

  1. A1
  2. B2
  3. C3
  4. D4.

Correct answer

B. 2

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