Math 9

5. Which of the following is a quadratic equation?
a. x2 = 100
b.1 + 6 = 3
c. 10x - 1 = 6
d. None of the above

6. In the equation ax2 + bx + c = 0, which of the following cannot be equal to 0 for the equation to be quadratic?
а.а
b. b
c.c
d. a, b, and c

7. Which of the following is written in the standard form of a quadratic equation?
a. x2-3 = 2x
b. 3x2 + 4x = 5
c. x2 = 1
d. 4x2 X + 1 = 0

8. What is the product of the roots of x2 - X- 12 = 0?
a. - 12
b. 1
c. - 1
d. 12

9. What is the sum of the roots of x2 - 7x - 18 = 0?
a. - 18
b. 7
c.-7
d. 18

10. What is the solution of the quadratic equation x2 = 225?
a. -+√15
b.-+ 15
c. 15 -
d. - 15​