Розв'язати рівняння
X^2 - 11x + 30 = 0 a = 1, b = -11, c = 30 D = b^2 - 4ac = (-11)^2 - 4*1*30 = 121 - 120 = 1 x1 = (-b+sqrt(D))/2a = (11+1)/2 = 12/2 = 6 x2 = (-b-sqrt(D))/2a = (11-1)/2 = 10/2 = 5