If 5+6i is a root of the polynomial function f(x),which of the following must also be a root of f(x)

The complex conjugate root theorem states that if a+bi (with a and b being numbers) is a root, then a-bi is also a root. Plugging that in here, this means that 5-6i is also a root

A= the square root of 3“if letters are anything like people, they’re all equal and deserve to be treated equally.”