Unit 9.2: Solving Quadratics by the Square Root Method

x² = 16

• ± 4
• ± 8
• 4
• 8

Tags

CCSS.8.EE.A.2

3x² = 12

• ± 2
• 2
• ± √12
• ± 4

Tags

CCSS.8.EE.A.2

-5x² = -50

• ± 5
• ± 10
• ± √10
• -10

Tags

CCSS.7.NS.A.2A

CCSS.7.NS.A.2B

x² + 4 = 68

• ± 8
• ± √8
• 8
• ± 64

Tags

CCSS.8.EE.A.2

7x² + 1 = 8

• ± 1
• ± 7
• ± √7
• ± 8

Tags

CCSS.8.EE.A.2

x² + 1 = 9

• ± √8
• ± 4
• ± 8
• ± 3

Tags

CCSS.8.EE.A.2

Solve.

x² +12 = 5

• x = ± 49

• No Real Solutions

• x = ± √7

• x = ± 3.5i

Tags

CCSS.HSA-REI.B.4B

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-REI.B.4B

5m² + 1 = 6

• m = 0

• m = 1 or -1

• m = √7

• m = 7/5 m = -7/5

Tags

CCSS.8.EE.A.2

3 + 9r² = 12

• r = 0

• no solution

• r = 3, r = -3

• r = 1, r = -1

Tags

CCSS.8.EE.A.2