Week 10 Quiz

Help finish the problem by completing step 2.

Step 1: x² - 4x + 4 = 20,

Step 2: (x - __ )² = 20

*Hint: Think about what goes in the blank*

• 4

• 2

• 8

• 20

Complete the square; what number goes in the blank?

x² + 6x + ____

• 9

• 36

• -36

• - 9

Complete the square, what is the new quadratic after filling in the blank?

x² + 14x + ____

• x² + 14x - 196

• x² + 14x + 49

• x² + 14x - 49

• x² + 14x + 196

Solve the following equation by completing the square:

n² - 2n - 3 = 0

• 3 and-1

• 4 and -4

• 5 and -3

• 8 and -7

Solve by completing the square.
y² + 10y = -9

• 1 and -12
• -1 and -9
• 1 and -9
• 1 and -1

Tags

CCSS.HSA-REI.B.4B

Solve
 3x² + 5x - 12 = 0

• x = -4/3, x = 3
• x = 4/3, x = -3
• x = -1, x = 4
• x = 1, x = -4

Tags

CCSS.HSA-REI.B.4B

What do you do to the b value to correctly complete the square?

• square it
• divide it by 2 and square the result
• divide it by 2 and take the square root of the result
• divide it by 2 only

Tags

CCSS.HSA-REI.B.4B

What is the first step to solving THIS equation by completing the square?

a² + 10a + 21 = 0

• Set the equation equal to zero

• Divide 10 by 2 and add the result to both sides

• Add a² and 10a together

• Subtract the 21 on both sides

Find the missing value "c" to create a perfect square trinomial:
x² + 26x + ___ 

• 13
• 136
• 169
• 26

Tags

CCSS.HSA.SSE.A.2

CCSS.HSA.SSE.B.3

Solve by completing the square.

x² -4x - 5 = 0

• 11 and -7

• 1 and 3

• 1.73 and -1.73

• 5 and -1