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21 May, 19:44

Which of the following is a polynomial with roots 5, 4i, and - 4i?

A.) f (x) = x3 - 5x2 + 20x - 16

B.) f (x) = x3 - 5x2 + 16x - 80

C.) f (x) = x3 - 20x2 + 5x - 16

D.) f (x) = x3 - 16x2 + 80x - 5

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Answers (1)
  1. 21 May, 21:58
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    (x-4i) (x+4i) = x^2+16

    (x^2+16) (x-5) = x^3-5x^2+16x-80

    Answer is B
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