11. The roots of a quadratic equation are 8 and 10. Which of the following
quadratic equations has these roots?
Ax2 - 18x + 80 = 0
B. x2 + 18x + 80 = 0
C x2 - 80x 18 = 0
D. x2 + 80x - 18 = 0
12. The roots of a quadratic equation are -3 and 15. Which of the following
quadratic equations has these roots?
A x2 - 12x + 45 = 0
B. x2 + 12x + 45 = 0
C.X2 - 12x - 45 = 0
D. x2 + 12x - 45 = 0
13. The roots of a quadratic equation are 2 and 0. Which of the following
quadratic equations has these roots?
A. x2 - 2x = 0
B. x2 + 2x = 0
C. *2 - 2x - 0 = 0
D. x2 + 2x - 0 = 0
14. The roots of a quadratic equation are 5 and 6. Which of the following
quadratic equations has these roots?
A 72 - 11x + 30 = 0
B. x2 + 11x + 30 = 0
C x2 - 11x - 30 = 0
D x2 + 11x - 30 = 0
15. The roots of a quadratic equation are 5 and -9. Which of the following
quadratic equations has these roots?
A. 72 - 4x + 45 = 0
B. x2 + 4x + 45 = 0
C. x2 - 4x - 45 = 0
D. x2 + 4x - 45 = 0
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Answer:
11. a
12. c
13. a
14. a
15. d