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

Question

Mathematics

Abbie Knox

1 December, 01:30

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

+4

Answers (2)

Know the Answer?

Sloane Lane · Answer 1

Hello,

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

Answer A

Sabrina Colon · Answer 2

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

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

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