Step-by-step explanation:
We are given the polynomial function;

A zero of a function is a factor of that function such that when used as the input value results in zero.
To illustrate;
If

is a factor of a function, then;

Means when 1 is inputed into the function the function results into zero.
We shall take the options one after the other to determine which is not a zero of the function;





ANSWER:
This means 5/2 is not a possible zero of this polynomial