Third degree polynomial with zeros $6$ and $-5+2i$ that passes through $(2,-63)$? 
Find a third degree polynomial with real coefficients which has $6$ and $-5+2i$ as zeros and $f(2)=-63$

I tried to substitute in the equation
$$ f(x)=ax^3 +bx^2 + cx +d = 0$$
by the two given zeros and use $f(2)= -63$. But I think we need another equation to determine all the coefficients.

Hint : $-5-2i$ must be the third root of the polynomial
