RICHELLEENOLPEIN RICHELLEENOLPEIN Math Answered 4. Which of the following quadratic equations has no real roots? a. x2 - 9x + 18 = 0 c. 2x2 + 12x - 3= 0 b. x2 - 4x + 18 = 0 d. 5x2 - 13x + 6 = 0