Upload
others
View
3
Download
0
Embed Size (px)
Citation preview
Section 7.6 Notes_F2016_wNotes.notebook
1
October 13, 2016
Section 7.6 Vertex Form of a Quadratic Function
The vertex form of a quadratic function is
When given the vertex form of a quadratic function, we should be able to name some properties of the graph just through observation, and NOT through graphing.
Ex) The graph of is shown below: State the
a) vertex
b) eq'n of A. of S.
c) direction of opening
d) yintercept
e) max or min value
Ex) The graph of is shown below: State the
a) vertex
b) eq'n of A. of S.
c) direction of opening
d) yintercept
e) max or min value
Section 7.6 Notes_F2016_wNotes.notebook
2
October 13, 2016
Ex) The graph of is shown below: State the
a) vertex
b) eq'n of A. of S.
c) direction of opening
d) yintercept
e) max or min value
Ex) The graph of is shown below: State the
a) vertex
b) eq'n of A. of S.
c) direction of opening
d) yintercept
e) max or min value
As you can see, there is a pattern. (p, q) in the equation is always the vertex.
If it is a positive 'a' value, the graph will open up and have a minimum value of q. A negative 'a' value will open down andhave a maximum value of q.
The equation of the axis of symmetry is always x = the 'p' value.
Section 7.6 Notes_F2016_wNotes.notebook
3
October 13, 2016
For each of the following equations, describe what the graph would look like:
the direction of openingthe vertexthe equation for the axis of symmetrythe domainthe rangemaximum or minimum value
a) y = 2(x 4)2
b) y = (x + 1)2 + 4
c) y = 3(x 5)2 + 8
d) y = x2 10
Section 7.6 Notes_F2016_wNotes.notebook
4
October 13, 2016
Ex) Write an equation for a parabola if its vertex is (1,4) and the graph passes through (2,2)
Ex) Predict if the function y = 2(x + 3)2 1 has a minimum or a maximum, then predict the number of xintercepts it has.
Note: When a quadratic function is in vertex form, the yintercept 'c' can be found by ______________
Ex) Find the yintercept for y = 2(x + 3)2 1
Section 7.6 Notes_F2016_wNotes.notebook
5
October 13, 2016
Ex) The path or a rocket is described by the function
where h(t) is the height of the rocket, in meters, and t is the time, in seconds, after the rocket is fired.
a) What is the maximum height reached by the rocket?
b) How many seconds after it was fired did the rocket reach this height?
c) How high above the ground was the rocket when it was fired?
Pages 417 420# 1 5, 7, 8, 10, 11,
12abc, and 14 16
Do not graph # 2
Section 7.6 Notes_F2016_wNotes.notebook
6
October 13, 2016
Section 7.6 Notes_F2016_wNotes.notebook
7
October 13, 2016