11. How many roots does the quadratic equation x² + 5x + 7 = 0 have?
a.0
b. 1
c.2
d. 3

12. The roots of a quadratic equation -5, and 3. Which of the following quadratic equations has these roots?
a. X² - 8x + 15 = 0
b. x² + 8x + 15 = 0
c. x² - 2x - 15 = 0
d. x² + 2x - 15 = 0

13. Which of the following has no real roots.?
a. Zr + 4x = 3
b. t? - 8x + 4 = 0
c. 3s² – 25=-5
d.-2r² +1 +7=0

14. One of the roots of 2x2 - 13x + 20 = 0 is 4. What is the other root?
a. -⅖
b. -5/2
c.⅖
d.5/2


15. What are the roots of the quadratic equation x2 + x - 56 = 0
a. 2 and -1
b. 8 and -7
c.-8 and 7
d. 3 and -2.​