I. MULTIPLE CHOICE: Choose and write the letter that corresponds to the correct answer for each
question below. (20 pts)
1. Which of the following is NOT an example of a quadratic equation?
A. 3x − 2 = 0 B. x + 3x2 = 0 C. (x-1) (x+1) = 0 D. (x − 2)2 = 0
2. The linear term of x2 − 2x − 8 = 0
A. x2
B. 2x C. -2x D. -8
3. The standard form of quadratic equation x (x − 5) = 36.
A. x2 − 5x = 36 B. x2 − 5x + 36 = 0 C. x2 + 5x + 36 = 0 D. x2 − 5x − 36 = 0
4. The quadratic equation x2 = 25 can be best solved by
A. Quadratic formula B. Completing the square C. factoring D. extracting square roots
5. The roots of the equation x 2 − x − 20 = 0, are
A. -5 and 4 B. 5 and -4 C. -5 and -4 D. 5 and 4
6. The factors of the polynomial x2 − 3x − 10
A. (x − 10)(x + 1) B. (x + 10)(x − 1) C. (x + 5)(x − 2) D. (x − 5)(x + 2)
7. Evaluate the expression b2 − 4ac given the values of a = 1; b = -3 ; c = -10.
A. 25 B. 36 C. 49 D. 64
8. The sum of the roots of the quadratic equation 2x2 + x − 1 = 0.
A. 1 B. -
1
2
C. 1
2
D. -1
9. The following are quadratic inequality EXCEPT
A. 2x2 − 4x = −3 C. y2 + 4y − 12 ≥ 0
B. x2 + 3x ≤ 18 D. 3x2 + 8x + 5 < 0
10. Which of the following equations represents a quadratic function?
A. y = x3 + 2x2 + 3 B. y = 2X + 3x C. y = x2 D. y = 2x + 1