Which of the following statements must be true about the polynomial function f(x)?
If1+ S13 is a root of f(x), then -1- VT3 is also a root of f(x).
If1 + 131 is a root of f(x), then 1 - 131 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 + / is a root of f(x), then 13 + i is also a root of f(x).