_____9. Solving quadratic equation by extracting square roots, what is the value of x in x2 = 144?
A.) 10 B.) 11 C.) 12 D.) 13

____10. What are the roots of the quadratic equation x2 – 3x – 10 = 0?
A.) 2 and 5 B.) -2 and 5 C) – 10 and 1 D.) 10 and -1

____11. What is the sum of the roots of the quadratic equation 2x2 + 8x −16=0?
A) 4 B.) -4 C) 8 D.) -8

____12. Which of the following values of x make the equation x2− 10x + 21 = 0 true? I. -7 II. -3 III. 3 IV. 7
A. I and II B) II and III C.) III and IV D.)IV and I

____13. Find the value of b2 −4ac in the equation x2 + 5x + 4=0.
A) 3 B.) 6 C) 8 D) 9

____14. Find the sum and the product of the roots of 3x2 + 9x + 27=0.
A.) -3 and 9 B) - 3 and - 9 C) 9 and -27 D) - 9 and - 27

____15. What is the product of the roots of the quadratic equation 2x2 + 8x −16=0?
A.) 4 B.) -4 C) 8 D) -8