1. Write each function in standard form.
Warm Up
Write each function in standard form.
Evaluate b2 – 4ac for the given values of the valuables.
1. f(x) = (x – 4)2 + 3
2. g(x) = 2(x + 6)2 – 11
4. a = 1, b = 3, c = –3
3. a = 2, b = 7, c = 5

2. Objectives Vocabulary
Solve quadratic equations using the Quadratic Formula.
Classify roots using the discriminant.
Vocabulary
discriminant

3. You can use the Quadratic Formula to solve any quadratic equation that is written in standard form, including equations with real solutions or complex solutions. Remember that all quadratics are symmetric about the _____________________

4. Example 1: Quadratic Functions
Find the zeros using the Quadratic Formula.
f(x)= 2x2 – 16x + 27
f(x) = 4x2 + 3x + 2

5. The discriminant is part of the Quadratic Formula that you can use to determine the number of real roots of a quadratic equation.

6. Example 3: Analyzing Quadratic Equations by Using the Discriminant
Find the type and number of solutions for the equation.
x = 12x
x = 12x
x = 12x

7. The graph shows related functions
The graph shows related functions. Notice that the number of real solutions for the equation can be changed by changing the value of the constant c.

8. Example 4: Sports Application
An athlete on a track team throws a shot put. The height y of the shot put in feet t seconds after it is thrown is modeled by y = –16t t The horizontal distance x in between the athlete and the shot put is modeled by x = 29.3t. To the nearest foot, how far does the shot put land from the athlete?

9. Properties of Solving Quadratic Equations

10. Properties of Solving Quadratic Equations

11. No matter which method you use to solve a quadratic equation, you should get the same answer.
Helpful Hint
HW pg e, 61-64