Unit Test #9

Select your answers to the following 10 questions from the pop-up menus in the right hand column. Clicking the "Begin Test Again" button will clear all the answers.

 

 

Q1:

 

If a quadratic equation has no real roots the value of the discriminant could be: A. -3
B. 0
C. 1
D. 3
Answer 1:

 

Q2:

 

If the value of the discriminant of a quadratic equation is 1 then the equation has:

A. 0 roots
B. 1 root
C. 2 roots
D. 3 roots
Answer 2:

 

Q3:

 

Find p so that x2 - 4x + p = 0 has one root.

A. 2
B. -2
C. 4
D. -4
Answer 3:

 

Q4:

 

What is the value of the discriminant for the equation px2 + qx + r = 0? A. q2 - 4pr
B. q2 + 4pr
C. r2 - 4pr
D. r2 - 4qr
Answer 4:

 

Q5:

 

Which of these equations has two real roots? A. x2 - 4x + 4 = 0
B. x2 - x + 5 = 0
C. x2 - 10x + 100 = 0
D. x2 - 4x + 3 = 0
Answer 5:

 

Q6:

 

In a quadratic equation, the value of b2 - 4ac is called: A. The denominator
B. The diameter
C. The discriminant
D. The divisor
Answer 6:

 

Q7:

 

Which is true for the equation x2 -5x + 12 = 0? A. There are two real roots 
B. There is one repeated root
C. There are no real roots
D. There are two rational roots.
Answer 7:

Q8:

 

What is the value of the discriminant for the quadratic equation 4x2 - 25 = 0? A. -100
B. 100
C. -400
D. 400
Answer 8:

 

Q9:

 

If the discriminant of a quadratic equation is -1, how many real roots will the equation have? A. -1
B. 0
C. 1
D. 2
Answer 9:

 

Q10:

 

Find p so that px2 + 8x + 16 = 0 has one real root A. p = 1
B. p = 2
C. p = 4
D. p = 8
Answer 10: