Solving Quadratics by Taking the Square Root

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.8.EE.A.2

x² + 4 = 68

• ± 8
• ± √8
• 8
• ± 64

Tags

CCSS.8.EE.A.2

Simplify √-4

• $\pm2i$

• 2i

• 2

• 4i

Tags

CCSS.HSN.CN.A.1

CCSS.HSN.CN.A.2

Simplify √-28

• -√28

• -2i√7

• $\pm2i\sqrt{7}$

• 28i

Tags

CCSS.HSN.CN.A.1

CCSS.HSN.CN.A.2

CCSS.HSN.RN.A.2

Simplify √-45

• $\pm3i\sqrt{5}$

• 3i√5

• -i√45

• 45i

Tags

CCSS.HSN.CN.A.1

CCSS.HSN.CN.A.2

CCSS.HSN.RN.A.1

CCSS.HSN.RN.A.2

Simplify √-1

• 1
• -i
• -1
• i

Tags

CCSS.HSN.CN.A.1

Simplify

• ± 2 √5
• ± 4 √5
• ± 5 √2
• ± 5 √4

Tags

CCSS.HSN.RN.A.2

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