gis7tinysapkeelenoa gis7tinysapkeelenoa

29-07-2016
Mathematics

Answered

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

Verified Answer :

29-07-2016

Hello,

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

Answer Link

Anonymous Anonymous

04-08-2016

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

Answer Link

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