Question 613866
multiply the imaginaries 1st, the +- i terms will mostly cancel


(x - 2 + i)(x - 2 - i) = x^2 - 4x + 4 - i^2 = x^2 - 4x + 5


(x - 1)(x^2 - 4x + 5) = x^3 - 4x^2 + 5x - x^2 + 4x - 5 = x^3 - 5x^2 + 9x - 5