Makeup Do Now for Solving Quadratics by Square Root Method

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

12.  Solve by factoring 
(x - 2 )² = 49

• -5, 9
• ^{7, -7}
• 9, -5
• ^{9, -9}

(x - 2) ² = 9

• ± 3
• 5  or  -1
• -5  or  1
• ± 9

Solve by taking square roots:
5m² + 1 = 6

• m = 0
• m = 1 or -1
• m = √7
• m = 7/5 m = -7/5

Solve by taking the square root:

x² = 49

• -7

• 7

• 49

• ±7

2x²=100

• x = ±25

• x = ±√50

• x = ±√100

• x = ±√5

x² -4 = 77

• 9

• -9

• No Real Solutions

• ±9

When do you use the plus or minus symbol?
±

• After taking the square root of both sides
• After adding the square to both sides
• After taking half of b
• After setting the equation equal to zero

What are the solutions?

• 0 and 8
• -2 and -4
• 3 and -1
• 2 and 4

Solve by taking square roots:
3 + 9r² = 12

• r = 0
• no solution
• r = 3, r = -3
• r = 1, r = -1