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4 August, 12:56

Two roots of a 3-degree polynomial equation are 5 and - 5. Which of the following cannot be the third root of the equation?

There are multiple answers.

5

5i

0

-5

-5i

+2
Answers (1)
  1. 4 August, 16:35
    0
    Imaginary roots always occur in pairs never on their own.

    Therefore 5i and - 5i cannot be the third root.
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