'CUA a*x^2+b*x+c=0 I: Discriminant >= 0 => x1, Discriminant < 0 => RE(x1) = RE(x2) J: Discriminant >= 0 => x2, Discriminant < 0 => IM(x1) = -IM(x2) M: a N: b O: c Ans: Discriminant ---------