Question 205026
if R is a root, then (x - R) is a factor


(x - 5 + 2i)(x - 5 - 2i) = x^2 - 5x - 2ix - 5x + 25 + 10i + 2ix - 10i - 4i^2 = x^2 - 10x + 29


0 = x^2 - 10x + 29