If a polynomial function f(x) has roots -8,1, and -6i , what must also be a root of f(x) ? a) -6 b) -6i c) 6-i d) 6

Heya !

In mathematics, the complex conjugate root theorem states that if P is a polynomial in one variable with real coefficients, and a + bi is a root of P with a and b real numbers, then its complex conjugate a − bi is also a root of P.

Here , one complex root is given -6i hence , the other must be 6i.

Hope it helps you ! :)