Solving Quadratics with the Square Root Method

x² = 16

• ± 4
• ± 8
• 4
• 8

3x² = 12

• ± 2
• 2
• ± √12
• ± 4

-5x² = -50

• ± 5
• ± 10
• ± √10
• -10

x² + 4 = 68

• ± 8
• ± √8
• 8
• ± 64

7x² + 1 = 8

• ± 1
• ± 7
• ± √7
• ± 8

(x + 1) ² = 25

• ± 5
• 4  or  -6
• -4  or  6
• ± 4

(x - 2) ² = 9

• ± 3
• 5  or  -1
• -5  or  1
• ± 9

Solve by taking square roots:

x² - 6 = 43

• x = √37

• x = 37 or - 37

• x = 7, x = -7

• no solution

Solve by taking square roots:

5x² - 4 = 41

• x = 9, x = -9

• x = 3, x = -3

• x = 8, x = -8

• no solution

Write the question and show all work.

4x²=100

• 25

• ±25

• 5

• ±5