Quadratic Formula and Discriminant

Determine the values of

a, b, and c for

the quadratic equation:

4x² – 8x = 3

• a = 4, b = -8, c = 3

• a = 4, b =-8, c =-3

• a = 4, b = 8, c = 3

• a = 4, b = 8, c = -3

If the discriminant of the quadratic equation is equal to 0, how many real solutions are there?

• None

• One

• Two

• Infinite

Tags

CCSS.HSA-REI.B.4B

If the discriminant of the quadratic equation is equal to 4, how many real solutions are there?

• None

• One

• Two

• Infinite

Tags

CCSS.HSA-REI.B.4B

If the discriminant is equal to -2, how many real solutions are there?

• None

• One

• Two

• Infinite

Tags

CCSS.HSA-REI.B.4B

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

• 76

• -7

• 9

• none of these

Tags

CCSS.HSA-REI.B.4B

Describe and correct the error a student made in solving an equation.

• The student used b instead of −b in the first term in the numerator when substituting values into the formula

• The student should have the equation as a(x−b)²+c=0 and then substituted those values into the Quadratic Formula.

• The student dropped the negative sign in simplifying the expression (−5)².

• The student used a instead of 2a in the denominator when substituting values into the formula.

Tags

CCSS.HSA-REI.B.4B

What is the quadratic formula?

Tags

CCSS.HSA-REI.B.4B

Use the quadratic formula to find the solutions for

y = -x² - 5x + 12

• No Real Solution

• 
• 
• 

Tags

CCSS.HSA-REI.B.4B

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

___________

y = x² + 4x + 4

• Positive

• Negative

• Zero

Tags

CCSS.HSA-REI.B.4B

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

• 76

• 29

• 68

• none of these

Tags

CCSS.HSA-REI.B.4B