Square Root Method

x² = 16

• ± 4
• ± 8
• 4
• 8

Tags

CCSS.HSA.REI.A.1

CCSS.HSA.REI.B.4

3x² = 12

• ± 2
• 2
• ± √12
• ± 4

Tags

CCSS.8.EE.A.2

x² + 4 = 68

• ± 8
• ± √8
• 8
• ± 64

Tags

CCSS.HSA.REI.A.1

CCSS.HSA.REI.B.4

7x² + 1 = 8

• ± 1
• ± 7
• ± √7
• ± 8

Tags

CCSS.HSA.CED.A.1

CCSS.HSA.REI.B.4

(x - 2) ² = 9

• ± 3
• 5  or  -1
• -5  or  1
• ± 9

Tags

CCSS.HSA.CED.A.1

CCSS.HSA.REI.B.4

(x - 2) ² = 49

• 9  or  -5
• ± 9
• ± 5
• ± 7

Tags

CCSS.HSA-REI.B.4B

 $\left(x+5\right)^2=81$  Evaluate using square roots.

• x = 5, x = 9

• x = 4, x = -14

• x =  $\pm2\sqrt{19}$  

• x =  $\pm$  9

Tags

CCSS.HSA.CED.A.1

CCSS.HSA.REI.B.4

3x² - 1 = 14

• 5
• -√5
• -√5, √5
• √5

Tags

CCSS.HSA.REI.A.1

CCSS.HSA.REI.B.4

(x + 1) ² = 25

• ± 5
• 4  or  -6
• -4  or  6
• ± 4

Tags

CCSS.HSA.CED.A.1

CCSS.HSA.REI.A.1

CCSS.HSA.REI.B.4

Simplify √-4

• 2i

• 2

• 4i

Tags

CCSS.HSN.CN.A.1

CCSS.HSN.CN.A.2