(х-1)*(х-2)=0 не могу решить

(х - 1)*(х - 2) = 0 x^2 - 2x - x + 2 = 0 x^2 - 3x + 2 = 0 D = 9 - 4*2 = 9 - 8 = 1;  √D = 1 x1 = (3 + 1)/ 2 = 2 x2 = (3 - 1)/2 = 1