Final answer:
The irrational conjugates theorem states that if a polynomial function with rational coefficients has a root that is an irrational number, then its conjugate must also be a root.
Step-by-step explanation:
The irrational conjugates theorem states that if a polynomial function with rational coefficients has a root that is an irrational number, then its conjugate (the same number with the opposite sign) must also be a root of the function.
In this case, if -√3 is a root of the polynomial function, then √3 must also be a root.