chapter 8.5(a) graphing quadratic functions.notebook · chapter 8.5(a) graphing quadratic...
Transcript of chapter 8.5(a) graphing quadratic functions.notebook · chapter 8.5(a) graphing quadratic...
chapter 8.5(a) graphing quadratic functions.notebook
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May 04, 2017
Apr 294:06 PM
Bellwork:
1) Write the equation of the line that contains the points (3, 4) and (7, 4).
2) Solve: 2x2 8x 10 = 0
3) Make a table and graph f(x) = x2 {use x = 2, 1, 0, 1, 2}
Apr 294:09 PM
Chapter 8.5(a) Quadratic Functions and Their Graphs
Be able to graph quadratic functions of the form f(x) = x2 + k, f(x) = (x h)2 and
f(x) = (x h)2 + k.
Apr 294:11 PM
Quadratic Function:
A quadratic function is a function that can be written in the form f(x) = ax2 + bx + c, where a, b, and c are real numbers and a ≠ 0.
1) Make a table and graph the following quadratic functions:
f(x) = x2 g(x) = x2 + 4 h(x) = x2 5
x y2 41 10 01 12 4
x y21012
x y21012
What do you notice about these functions and their graphs?
May 19:27 AM
Graphing the Parabola Defined by f(x) = x2 + k
The graph f(x) = x2 + k is the graph of y = x2 shifted upward k units.
The graph of f(x) = x2 k is the graph of y = x2 shifted downward k units.
The Vertex is (0, k), and the axis of symmetry is the yaxis.
May 19:42 AM
2) Graph the following functions (without a table)
a. f(x) = x2 + 1
May 19:44 AM
3) Make a table and graph the following functions
f(x) = x2 n(x) = (x + 3)2 p(x) = (x 4)2
x y2 41 10 01 12 4
x y54321
x y23456
What do you notice about these functions and their graphs?
chapter 8.5(a) graphing quadratic functions.notebook
2
May 04, 2017
May 19:46 AM
Graphing a Parabola Defined by f(x) = (x h)2
The graph of f(x) = (x h)2 is the graph of y = x2 shifted to the right h units.
The graph of f(x) = (x + h)2 is the graph of y = x2 shifted to the left h units.
The vertex is (h, 0) and axis of symmetry is the vertical line x = h.
Remember: h is the opposite of the sign in the parenthesis.
May 19:51 AM
4) Graph the following without a table.
a. g(x) = (x 4)2
May 19:53 AM
We can put the two types parabolas together to move both up/down and left/right.
5) How do you think the following parabola will move?
h(x) = (x 2)2 + 3
May 19:56 AM
Graphing the Parabola Defined by f(x) = (x h)2 + k
The parabola has the same shape as y = x2.
The vertex is (h, k), and the axis of symmetry is the vertical line x = h.
Remember: h is the opposite of the sign in the parenthesis.
May 19:58 AM
6) Graph the following without a table.
a. b(x) = (x + 2)2 4
May 110:00 AM
What is the vertex of the following parabola?
f(x) = (x + 10) + 12
What is important to remember about the hvalue?
chapter 8.5(a) graphing quadratic functions.notebook
3
May 04, 2017
May 110:01 AM
Homework:
8.5(a) Graphing Quadratic Functions WS
May 44:20 PM
Mar 212:49 PM