If a polynomial function f x has roots 4 13i | StudyX The complex root is 4 – 13i The complex conjugate of this root is 4 + 13i (x - 4 + 13i) and (x - 4 - 13i) for the complex roots (x - 5) for the real root (x^2 - 8x + 185) (x - 5) is a factor of f (x)