Quadratic Formula and Discriminant Practice

INSTRUCTIONS FOR THIS QUIZIZZ:

For the problems solved using the quadratic formula (6 questions), you MUST get paper and show your work!

Then put it into the "turn in" basket on the table for daily points.

Choose "yes" if you understand the instructions.

**(For those with the sub teacher today. Be sure to use your manners. )

• YES, I will show my work on the quadratic formula questions. I understand that I must show substitution and "do the math" for as many questions as possible during the class period.

• ....

Tags

CCSS.HSA-REI.B.4B

Use the picture for reference (you can click it and it will pop up larger),

then drag and drop the parts of the quadratic formula in order.

• Opposite of b

  (-b)

• b squared

• minus 4ac

• Plus or minus the square root of

• all over 2a

  (denominator)

Tags

CCSS.HSA-REI.B.4B

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

• a = 2 , b = 3, c = -5

• a = 2, b = -3, c = 5

• a = 2, b = -3, c = -5

• a = -2, b = 3, c = 5

Identify a, b, and c in: x²−6x+14

• 3,5,9
• 1,-6,14
• 1,-6,-14
• 1,6,14

Why are quadratic equations set equal to zero?

• Because zero is an easy number to work with.

• Because we are trying to find the x-intercepts and that happens when y=0.

• Because setting it equal to zero helps us find the y-intercepts.

• None of the above

Tags

CCSS.HSA-REI.B.4B

What should you do first in solving this equation?

x² + 6x - 13 = 3

• Factor

• Write down: a = 1, b = 6, c = -13

• Subtract 3 from both sides.

• Add 3 to both sides.

Tags

CCSS.HSA-REI.B.4B

• x = 7 and -2

• x = 7 and 2

• x = -7 and -2

• x = -7 and 2

Tags

CCSS.HSA-REI.B.4B

Solve using the quadratic formula :

x² - 7x + 12 = 0

• x = 3, -4

• x = -3, 4

• x = 3, 4

• x = -3, -4

Tags

CCSS.HSA-REI.B.4B

Tags

CCSS.HSA-REI.B.4B