Quadratic Formula

Quadratic Formula

Watch each video and answer the questions that follow.

Multiple Choice

The quadratic equation can be used to solve quadratic equations that cannot be factored.

• True

• False

Multiple Choice

What is the following equation written in standard form?

 $-3x^2+7x\ =\ 9$  

•  $-3x^2+7x+9=0$  

•  $-3x^2-2x=0$  

•  $-3x^2+7x-9=0$  

• -5x

Multiple Choice

What should you do first in solving this equation?

x² + 6x - 13 = 3

• Get factored form

• Write down: a=1, b=6, c=-13

• Make it equal 0 by subtracting 3 on each side

• Type it all in a calculator.

Multiple Choice

Determine the values of

a, b, and c for

the quadratic equation:

4x² – 8x = 3

*remember right side should =0

• a = 4, b = -8, c = 3

• a = 4, b =-8, c =-3

• a = 4, b = 8, c = 3

• a = 4, b = 8, c = -3

Multiple Choice

Identify a, b, and c in: x²−6x+14

• 3,5,9

• 1,-6,14

• 1,-6,-14

• 1,6,14

Multiple Choice

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.

Multiple Choice

Identify the values of A, B, and C

5x² + x - 18 = - 9x + 3x²

• A=2, B=10, C=-18

• A=5, B=1, C=-18

• A=8, B=-8, C=-18

• A=2, B=9, C=-18

Multiple Choice

Identify the values of A, B, and C

3m² - 14 = 11m

• A=3, B=-11, C=-14

• A=3, B=-14, C=11

• A=3, B=11, C=-14

• A=3, B=-14, C=11

Multiple Choice

b² would equal: y = 2x² -x -3

• 2

• -1

• 1

• -3

Multiple Choice

4ac would equal: y = 2x² -x -3

• -12

• 8

• -24

• -1

Multiple Choice

b² - 4ac would equal: y = 2x² -x -3

• 25

• -23

• -25

• 0

Multiple Choice

Solve Using the Quadratic Formula

x² + 4x - 40 = -8

• -10 & -4

• -4 & 10

• -8 & 4

• 8 & -4

Multiple Choice

Solve using the Quadratic Formula:

x² + 4x + 3 = 0

• x = 1 and x = 3

• x = 6 and x = -2

• x = -1 and x = -3

Multiple Choice

Solve 2x² + 7x - 15 = 0

• -3/2 or 5

• No Solution

• -5 or 3/2

• 0.7 or 5

Multiple Choice

Solve Using the Quadratic Formula

x² + 4x - 40 = -8

• -10 & -4

• -4 & 10

• -8 & 4

• 8 & -4

Multiple Choice

Solve using the Quadratic Formula.

• A
• B
• C
• D