Solving Quadratic Equations by Completing the Square

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

Tags

CCSS.HSA.REI.A.1

CCSS.HSA.REI.B.4

• -100

• 100

• -25

• 25

Tags

CCSS.HSA.SSE.A.2

CCSS.HSA.SSE.B.3

• 4

• -4

• 16

• -16

Tags

CCSS.HSA.SSE.A.2

CCSS.HSA.SSE.B.3

• 4

• 2

• 8

• 16

Tags

CCSS.HSA.REI.B.4

CCSS.HSA.SSE.A.2

CCSS.HSA.SSE.B.3

What is the correct order for solving quadratic equations by completing the square.

Tags

CCSS.HSA.REI.A.1

CCSS.HSA.REI.B.4

Tags

CCSS.HSA.CED.A.1

CCSS.HSA.CED.A.4

CCSS.HSA.REI.A.1

CCSS.HSA.REI.B.4

Tags

CCSS.HSA.REI.A.1

CCSS.HSA.REI.B.4

Tags

CCSS.HSA.REI.B.4

CCSS.HSA.SSE.A.2

CCSS.HSA.SSE.B.3

Tags

CCSS.HSA.CED.A.1

CCSS.HSA.REI.B.4

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

Tags

CCSS.HSA.REI.A.1

CCSS.HSA.REI.B.4