8.04 Practice

8.04 Practice

Multiple Choice

Which of the following is not the same as "solution"?

• x-intercept

• roots

• zeros

• y-intercept

Multiple Choice

The solutions of a quadratic equation are known as the _____.

• Vertices

• Roots

• Squares

• Formulas

Multiple Choice

How many roots does y=x² + 2x - 3 have?

• one

• two

• none

Multiple Choice

How many roots does y=x² - 8x + 16 have?

• one

• two

• none

Multiple Choice

How many zeros does this parabola have?

• 3

• 2

• 0

• 1

Multiple Choice

Which is a zero of the graph?

• 0

• -1

• 1.5

• -3

Multiple Choice

What are the green dots called?

• axis of symmetry

• vertex

• parabola

• roots or x-intercepts

Multiple Choice

What are the x- intercepts?

• x= 0 and x= -4

• x= 0 and x= 4

• y= 0

• x= 2

Multiple Choice

Evaluate x=-1 when y=x²+x-12

• 36

• -12

• -43

Multiple Choice

Evaluate x=-4 when y=-x²+2x-8

• -32

• -84

• -10

Multiple Choice

In the equation

y = x² +5x +7, match each leading coefficient with its correct letter

• a=0, b=5, c=7

• a=1, b=5, c=7

• a=7, b=5, c=1

Multiple Choice

The discriminant is

• aX² + bX + c

• b - 4ac

• b² - 4ac

• b² + 4ac

Multiple Choice

A function has a discriminant of 25.

______________

How many solutions does it have?

• 0

• 1

• 2

• 5

Multiple Choice

What is the discriminant of 6x² − 2x − 3 = 0

• 76

• 29

• 68

• none of these

6x² − 2x − 3 = 0

• a=6, b=-2, c=-3

•  $\left(-2\right)^2-4\left(6\right)\left(-3\right)$  

•  $4+72$  

•  $76$  

Multiple Choice

What is the discriminant of -2x² − x − 1 = 0

• 76

• -7

• 9

• none of these

-2x² − x − 1 = 0

•  $a=-2,\ b=-1,\ c=-1$  

•  $\left(-1\right)^2-4\left(-2\right)\left(-1\right)$  

•  $1-8$  

• -7

Multiple Choice

For the function below, is the discriminant positive, negative, or zero?

___________

y = x² + 4x + 4

• Positive

• Negative

• Zero

• Not Sure

y = x² + 4x + 4

• a=1, b=4, c=4

• 
  
   $\left(4\right)^2-4\left(1\right)\left(4\right)$  
  

•  $16-16$  

• 0

• zero (one solution)

Multiple Choice

____________

For the function above, is the discriminant positive, negative, or zero?

• Positive

• Negative

• Zero

• Not Sure