Solving Simple Quadratics by Taking Square Root

Use the square root property to solve the Quadratic Equation.
2(x - 4)² = 200

• ±10

• -14, 6

• -6, 14

• 100

When solving a quadratic equation, 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

2x²=100

• x = √25

• x = ±5√2

• x = √100

• x = ±√5

Solve.

(2x - 4)² = 16

• x = 4

• x = 10

• x = -2

• x = 0, 4

What are the solutions?

• -2, 1

• 1, 2

• -1,2

• 0,-4

Solve for x.

x² = 36

• x = ± 6

• x = ± 18

• x = 6

• x = 18

Solve for x.

x² - 49 = 0

• x = ± 7

• x = √49

• x = ± 49

• (x - 7)(x + 7) = 0

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

Solve for x.

3x² = 48

• x = ± 4

• x = ± 12

• x = ± 16

• x = √16

Solve for x.

(x - 7)² + 4 = 40

• x = -1, -13

• x = 1, 7

• x = -1, -7

• x = 1, 13

• x = -7, -13