Completing the Square Next Step

Step 2 says to get the constants on a side by themselves. To this we need to...

• subtract x² from both sides.

• subtract 10x from both sides.

What is the next step?

• Get the constants on a side by themselves.

• Factor both sides.

• Take the square root of both sides.

• -10

• -5

• 25

• 121

What is the next step?

• add 5 to both sides.

• Take the square root of both sides.

• Divide 18 by 2, then square that number and add it to both sides of the equation

• Square 18 and then add it both sides of the equation

• It already is a perfect square

• Subtract 18x from both sides and then divide both sides by x to find the answer

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

To solve by completing the square, what needs to be moved in this equation?
x² = 9 - 4x

• the -4x

• the 9

• the x²

When factoring
x² - 4x + 4 = 20,
what goes in the blank?
(x - __ )² = 20

• 4

• 2

• 8

• 20