300
                                The simplest way to handle a polynomial root theorem for when the problem reaches:
(x-(n + ni))(x -(n - ni))
                                What is: (n + ni) + (n - ni).
The ni's cancel leaving n + n, which finds the center value.
I.E: (x - (3 + 2i))(x - (3 - 2i)) = (x2 - 6x + 13)