Here, we define [color=#ff0000][i]m[/i][/color] and [color=#ff0000][i]n[/i][/color] are roots of the Quadratic Equation. Then, we have[br][br]Sum of roots = [color=#ff0000][i]m + n = -b/a  [/i][/color]Product of Roots = [color=#ff0000][i]mn = +c/a[/i][/color]

＃注意：香港有教科書會用 [math]\alpha[/math] 及 [math]\beta[/math] 替代。