Practice Quadratic Formula

Solve Using the Quadratic Formula
 x² + 4x - 40 = -8

• -10 & -4

• -4 & 10

• -8 & 4

• 8 & -4

What is this formula?

• This is the speed of light formula.

• This is the quadratic formula.

• This is the zero product property.

• This is the least squares formula

Which of the following would be the best first step in using the quadratic formula to solve a quadratic equation?

• Identify A, B, and C

• Set one side of the equation equal to zero

• No Solution, because there is a negative under the square root.

Fill in quadratic formula

j

h

d

a^2

b²-4ac

-2a

b^2+4ac

4ac-b^2

-b^2-4ac

2a

-b

b

b^2

Tags

CCSS.MATH.CONTENT.HSN.CN.C.7

CCSS.MATH.CONTENT.HSA.SSE.A.1.b

Solve the quadratic equation.
2p² - 2p - 55 = 5

• A .  {3.28, -2.28}

• B .  {2.5, -1.78}

• C . {6, -5}

• D . {-1, 4}

Solve using the quadratic formula.

• x = 7, x = 5

• x = 2, x = 1/3

• x = 6, x = 7

• x = 14, x= 13

Solve for x.  Round to the nearest hundredth if necessary.
x² + 11x + 5 = -5

• x = -1, -10

• x = 1, 10

• x = 0, 11

• x = 0, -11

Solve the quadratic equation.
3x² - 8x - 8 = 0

•   {0.38, -0.88} 

• {0.89, -8.9}

• . {0.13, -0.63}

• . {3.44, -0.77}

Solve for x:
8x² + 24 = 0

• x = ± i √ (3)

• x = ± 3i

• x = ± √(3)

• x = ± 2