If a polynomial function f of x has roots negative 9 and 7 minus i , what must be a factor of f of x ?
A
open paren x plus open paren 7 minus i close paren close parenB
open paren x minus open paren negative 7 minus i close paren close parenC
open paren x minus open paren 7 plus i close paren close parenD
open paren x plus open paren 7 plus i close paren close paren