1. 5-Minute Check Lesson 4-2 Answer: 2
If y varies jointly as x and z and inversely as the square of w, and y=3
when x=3, z=10 and w=2, find y when x=4, z=20 and w=4.
Answer: 2

2. 4-2 Warm Up #2 Is x = -1 a root of
What does the root represent graphically in question #1?
What is the root of
How many roots does have?
What are the roots of
Yes ; 0 = (-1)(-1) + 2(-1) + 1
The x-intercepts of the graph.
X= -5/3
2; there are two x-intercepts in the graph
x = & x = 4.19

3. 4.2 - Quadratics
Solving quadratics and using discriminants

4. Quadratic Equations - form
The discriminant can tell us how many roots/zeros a quadratic equation has .
Calculated:

5. Solving for roots/zeros of quadratics
To solve , there are 4 methods:
METHODS OF SOLVING QUADRATICS:
Factoring
Quadratic Formula
Graphing (finding x-intercepts)
Completing the square

6. Solve the following by all 4 methods but first determine the # of solutions using the discriminant.

7. Factoring
Quadratic Formula
Graphing (finding x-intercepts)
Completing the square

8. Finding Zeros of Quadratics
Quadratic Equations - form
You can solve a quadratic equation to determine the time it takes to drop a bean bag from an airplane!!

9. Solve each of the following by any method but first determine the # of solutions using the discriminant.
a.)
b.)

10. 4-2 Practice Worksheet