4. In a quadratic equation, what do you call the value b² − 4ac?
A. Denominator C. Diameter
C. Divisor D. Discriminant

5. Which of the following quadratic equations has no real roots?
A. t² - 8t - 4 = 0
B. t² - 8t + 4 = 0
C. 2x² + 4x = 3
D. 2r² + r + 7 = 0

6. The roots of a quadratic equations are −5 and 3. Which of the following
quadratic equations have these roots?
. x² - 2x + 15 = 0
. x² + 2x + 15 = 0
. x² - 2x − 15 = 0
. x² + 2x − 15 = 0

7. What is the sum of the roots of the quadratic equation
2 − 2 − 3 = 0?
A. 2 C. −2
B. 3 D. −3

8. What is the product of the roots of the quadratic equation x² - 2x − 3 = 0?
A. 2
B. 3
C. -2
D. -3

9. What is the sum of the roots of x² = 10x − 25?
A. 10
B. 25
C. -10
D. -3

10. What is the product of the roots of x² - 11x + 28 = 0?
A. 10
B. 28
C. -10
D. -28