9.2 Solving Quadratics with Square Roots Day 1

Solve for x     x² - 4 = 76

• x = 4 , -4
• x = 4√5    ,  -4√5
• x = 80   ,  x = -80
• x = 5√4    or    -5√4

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CCSS.8.EE.A.2

• ±23.25
• ±5
• ±25
• No real solution

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CCSS.8.EE.A.2

• ±81
• ±9
• ±3
• No real solution

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CCSS.8.EE.A.2

• ±√9
• ±3
• ±1
• No real solution

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CCSS.8.EE.A.2

x²+7=20

• x=13, -13

• 
• 
• x=27, -27

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CCSS.8.EE.A.2

Solve for x     x² - 4 = 76

• x = 4 , -4
• x = 4√5    ,  -4√5
• x = 80   ,  x = -80
• x = 5√4    or    -5√4

Tags

CCSS.8.EE.A.2

Solve for x

3x² = -60

• no real solutions

• √20

• -2√5

• -√20

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CCSS.8.EE.A.2

3x² = 12

• ± 2
• 2
• ± √12
• ± 4

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CCSS.8.EE.A.2

7x² + 1 = 8

• ± 1
• ± 7
• ± √7
• ± 8

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CCSS.8.EE.A.2

Solve by taking square roots:
k² - 6 = 43

• k = √37
• k = 37 or - 37
• k = 7, k = -7
• no solution

Tags

CCSS.HSA-REI.B.4B