Oh 9i is a root of the polynomial function f (x), which of the following must also be a root of f (x) ? A. - 9i B. - 1/9i C. 1/9i D. 9 - i

The best answer is A. The possible roots of this polynomial function 9i and - 9i. It is possible that this polynomial function is a quadratic equation. It has a degree of two which means there are two roots and it is possible that the positive and negative value of 9i are its roots.