Finding the Roots of a Quadratic

What are the solutions?

• -2, 1

• 1, 2

• -1,2

• 0,-4

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

• ±10

• -14, 6

• -6, 14

• 100

Solve

x² + 2x - 20 = 4

• x = -6, x = 4

• x = 6, x = -4

• x = 12, x = -2

• x = 8, x = -3

Solve by taking square roots:

5m² + 1 = 6

• m = 1

• m = 1 or -1

• m = √7

• m = 7/5 m = -7/5

Solve using square roots.
4m² - 100 = 0

• m=25, -25

• m=96

• m=5, -5

• m=-96

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

n² - 2n = 0

• n = 2 and 0

• n = -2 and 0

• n = 2

• n = 0

(2x - 4)² = 16

• x = 4

• x = 10

• x = -2

• x = 0, 4

What is another word for zeros?

• y-intercepts

• roots

• vertex

• axis of symmetry