Solving Quadratic Equations Using Square Roots

2x²= 30

• x= ±√5

• x= ±√30

• x= ±√15

• x= ±5

x²=25

• x = 5
• x = -5
• x = ±25
• x = ±5

Tags

CCSS.8.EE.A.2

2x²=100

• x = ±√25

• x = ±5√2

• x = ±√100

• x = ±√5

x²−10=19

• x = ±√29

• x = ±2√9

• x = ±29

• x = ±5√19

3x²+12=39

• x = √27
• x = ±3√27
• x = ±3
• x = ±9

Tags

CCSS.8.EE.A.2

Solve x²− 4 = 0

•  2 and -2
• 4 and -4
• 16 and -16
• 8 and -8

Tags

CCSS.HSA-REI.B.4B

Solve using square roots.

• ±81
• ±9
• ±3
• No real solution

Tags

CCSS.8.EE.A.2

Solve using square roots.

• √3
• ±√3
• -3
• No real solution

Tags

CCSS.HSA-REI.B.4B

Solve using square roots.

• ± 1/4
• ± 9/36
• ± 1/2
• No real solution

Tags

CCSS.HSA-REI.B.4B

Solve using square roots.
5b² - 4 = 41

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

Tags

CCSS.8.EE.A.2