1. Warm-up
Factor these 4 problems in your notes

3. Birthdays 2nd Period Safiya Muqueet November 10th
Austin Victor November 10th

4. Birthdays 3rd Period Lauren Miller November 9th
Teresa Monreal November 12th

5. Quick Write
Take out a single sheet of paper and write your name at the top.
In the next 2 minutes, write down everything you know about Quadratics??

6. Substitute Tomorrow Please make sure she is welcomed!
You will be using calculators to find key quadratic information

7. Section 4-2 Vertex Format Pages 245-251
Chapter 4
Section 4-2
Vertex Format
Pages

8. Objectives
I can read key information from vertex format: vertex point, AOS, and opening direction, plus find the y-intercept
I can graph quadratic functions in vertex form.

9. is called a quadratic function.
f (x) = a(x – h)2 + k
is called a quadratic function.
The graph of a quadratic function is a parabola.
Every parabola is symmetrical about a line called the axis of symmetry (AOS). x y
The intersection point of the parabola and the axis is called the vertex point of the parabola.
f (x) = a(x – h)2 + k
vertex
Axis of Symmetry
Quadratic function

10. Standard Vertex Format
Standard Vertex Format of a quadratic
y = a(x – h)2 + k
Vertex is (h , k)
Axis of Symmetry is x = h
If a > o, then the parabola opens upward
If a < o, then the parabola opens downward

11. Examples Vertex Format Vertex Axis of Sym y = (x – 0)2 + 0 (0,0) x = 0

12. y-intercept
To find the y-intercept of any equation, let all the x’s be ZERO
y = 3x2 + 6x + 9
y-intercept is (0, 9)
y = 3(x – 2)2 - 4
y-intercept is (0, 8)

13. Ex 1: y = (x – 2)2 + 3
Vertex Point:
AOS:
Opening:
y-int:

14. Ex 2: y = (x + 4)2 - 1
Vertex Point:
AOS:
Opening:
y-int:

15. Ex 3: y =-2 (x + 1)2 - 5
Vertex Point:
AOS:
Opening:
y-int:

16. Comparing
How does Vertex Format compare with anything else you learned earlier this year?
Transformations???

17. Homework
Worksheet 5-5