1. Activity 4-5 Quadratic Formula
To solve a quadratic equation of the form ax2 + bx + c = 0, a ≠ 0 using the quadratic formula
Set the quadratic equation equal to 0.
Identify the coefficients a, b, and c.
Substitute these values into the formula and simplify
Check your solutions.
For a parabola with x-intercepts, the axis of symmetry is always midway between the x-intercepts of the parabola
The distance from the axis of symmetry to either x-intercept is

2. Annual number of Deaths of Motorcyclists Aged 30-39, 1991-2000
Motorcycle Deaths
Annual number of Deaths of Motorcyclists Aged 30-39,
Year
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
# of deaths
711
638
647
584
562
541
547
599
601
687
This data can be modeled by the equation: n = 6.875x2 – 80.76x where n is the number of deaths and x represents the number of years since 1990.
You want to know when the deaths of is approximately Write an equation to determine this.
Solve this equation using the quadratic formula. Interpret your answer.

3. Quadratic Formula
For the quadratic functions below, solve by using the quadratic formula:
2x2 + 9x – 5 = 0
x2 + 5x = 13

4. Finding the x-intercepts
For the quadratic functions below, determine the x-intercepts of the graph.
F(x) = 2x2 – 6x – 3
H(x) = x2 – 8x + 16

5. Transitions Notebook
P odds
P odds