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COMEDK2019MathematicsQuadratic Equation

The real root of the equation x³-6 x+9=0 is

Options

  1. A-6
  2. B-9
  3. C6
  4. D-3

Correct answer

D. -3

Step-by-step solution

We have, gathered x³-6 x+9=0 (x+3) (x²-3 x+3 )=0 x+3=0 [ x²-3 x+3 0, x R ] x=-3 gathered

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