Which of the following statements must be true about the polynomial function f(x)?
If 1+ V13 is a root of f(x), then - 1 - /13 is also a root of f(x).
If 1 + 13i is a root of f(x), then 1-13i is also a root of f(x).
If 13 is a root of f(x), then -13 is also a root of f(x).
If-13 + i is a root of f(x), then 13+ i is also a root of f(x).