GRADE 9 - MATH

___1. What mathematical sentence is in the second degree and can be written in the standard form ax2+bx+c=0, where a, b and c are real numbers and a≠0?

a. Linear Equation in one variable
b. Quadratic Equation in one variable
c. Linear Equations in two variables
d. Quadratic Equations in two variables

___2. Which of the following is NOT written in the standard form of quadratic equation?

a. 5x2+3x-8=0
b. x2-2+20=0
c. -5x2+3=0
d. x2-8x=0

___3. What are the values of x in the equation x2=144?

a. {12, -12}
c. {72, -72}
b. 12 only
d. -72 only

___4. Which of the following refers to the quadratic formula?

a. x2+y2x2-y2=0
b. b2-4ac
c. x=c
d. x=-b±b2-4ac2a

___5. What method was used in solving the following quadratic equation?
x2-8x=9
x2-8x+16=9+16
(x-4)2=25
x-4=±5
x1=9 ; x2=-1

a. Extracting the Square Root
b. Completing the Square
c. Factoring
d. Quadratic Formula

___6. The easiest way to obtain the roots of 25x2-9=0 is by __________.
a. Extracting the Square Root
b. Factoring
c. Completing the Square
d. Quadratic Formula

___7. What are the factors of x2+5x+6=0?

a. {-2, -3}
b. {2,3}
c. {-2, 3}
d. {2, -3}

___8. Which of the following refers to the discriminant formula?

a. x2+y2x2-y2=0
b. b2-4ac
c. x=c
d. x=-b±b2-4ac2a

___9. What conclusion can be drawn from the discriminant of 9x2-16+35=0?

a. The roots are real and equal.
b. The roots are rational but not equal.
c. The roots are irrational and are not equal.
d. It has no real roots.

___10. When the discriminant of a quadratic equation is 0, it means _______.
a. The roots are real and equal.
b. The roots are rational but not equal.
c. The roots are irrational and are not equal.
d. It has no real roots.

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