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.HSA.CED.A.1

CCSS.HSA.REI.B.4

-5x² = -50

• ± 5
• ± 10
• ± √10
• -10

Tags

CCSS.HSA.CED.A.1

CCSS.HSA.REI.B.4

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.8.EE.A.2

(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

(x - 2) ² = 9

• ± 3
• 5  or  -1
• -5  or  1
• ± 9

Tags

CCSS.HSA.CED.A.1

CCSS.HSA.REI.B.4

x² + 1 = 9

• ± √8
• ± 4
• ± 8
• ± 3

Tags

CCSS.HSA.CED.A.1

CCSS.HSA.REI.A.1

CCSS.HSA.REI.B.4

(x - 2) ² = 49

• 9  or  -5
• ± 9
• ± 5
• ± 7

Tags

CCSS.HSA.CED.A.1

CCSS.HSA.REI.B.4

Solve by taking square roots:
5b² - 4 = 41

• b = 9, b = -9
• b = 3, b = -3
• b = 8, b = -8
• no solution

Tags

CCSS.HSA.CED.A.1

CCSS.HSA.REI.A.2

CCSS.HSA.REI.B.4