Determine Whether the Statement Is True or False

True/False

Determine whether the statement is true or false.
- $$\text { If } \mathrm { f } ( \mathrm { x } ) \text { is a polynomial having only real coefficients and } 2 - 4 i \text { is a zero of } \mathrm { f } ( \mathrm { x } ) \text {, then } 2 + 4 i \text { is also a zero. }$$