The Quadratic Formula

Chapter 8.6

The Quadratic Formula

If , then 2 0ax bx c 2 4

2

b b acx

a

Factor

x2 + 8x + 7 = 0

Factor

x2 + 11x + 18 = 0

Factor

x2 - 4x = 4

Factor

x2 - 6x = 8

Solve

4x2 + 12x + 9 = 0

Solve

3x2 - 7x = -2

Solve

3x2 = 15x + 18

A diver jumps from a platform which is 10 m above the water. Her height h in meters above the water t seconds after she jumps is modeled by the equation h = -4.9t2 + 3.5t + 10.8. About how long will it take her to reach the water?

A diver jumps from a platform which is 10 m above the water. Her height h in meters above the water t seconds after she jumps is modeled by the equation h = -4.9t2 + 3.5t + 10.8. About how long will it take the ball to reach the ground?

Homework