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21 July, 03:17

If 9i is a root of the polynomial function f (x), which of the following must also be a root of f (x) ?

A.-9iB.-1/9i C. 1/9i D. 9-i

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Answers (2)
  1. 21 July, 03:19
    0
    If you have a complex root of a polynomial function a+bi it must have also it's conjugate a-bi as a root.

    If 9i is a root for polynomial function f (x) then also is - 9i.

    Final answer: A. - 9i
  2. 21 July, 03:33
    0
    Hello,

    conjugate of 9i is - 9i is also a root.

    Answer A
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