Download presentation
Presentation is loading. Please wait.
Published byGiles Porter Modified over 9 years ago
1
Functions
2
Evaluating Functions Graphing Functions
3
Functions Evaluating Functions You can evaluate any function at any value using the key.
4
Example If f(x) = 3x 2 + 5x – 1, find f(–4)
5
Example If f(x) = 3x 2 + 5x – 1, find f(–4) This means to evaluate the expression 3x 2 + 5x – 1 when x has the value of –4
6
Example If f(x) = 3x 2 + 5x – 1, find f(–4) This means to evaluate the expression 3x 2 + 5x – 1 when x has the value of –4 Store –4 to x
7
Example If f(x) = 3x 2 + 5x – 1, find f(–4) This means to evaluate the expression 3x 2 + 5x – 1 when x has the value of –4 Store –4 to x Enter the expression to be evaluated (exactly as shown)
8
Example If f(x) = 3x 2 + 5x – 1, find f(–4) This means to evaluate the expression 3x 2 + 5x – 1 when x has the value of –4 Store –4 to x Enter the expression exactly as shown Press
9
Example If f(x) = 3x 2 + 5x – 1, find f(-4) The screen will look like: Thus, f(-4) = 27
10
Functions Graphing Functions You can graph any function of the form f(x) = by letting y = f(x). Just remember y= and f(x)= mean the same thing. That is, when you are given a function f(x), enter that in your calculator as Y=.
11
Example Graph the function f(x) =and label two points on the graph.
12
Example Graph the function f(x) =and label two points on the graph. Consider y= Enter the function as y= ( this gets absolute value)
13
Example Graph the function f(x) =and label two points on the graph. The screen will show: The graph will look like this:
14
Example To find two points on the graph, press to find one and move the arrow key to find another one (or look at the table) The window will show: This gives you one ordered pair (0,3), move cursor to find another one or press 2 nd GRAPH see a table of values.
15
Example Graph the function f(x) = -2x 2 – 4x + 1 and label two points on the graph.
16
Example Graph the function f(x) = -2x 2 – 4x + 1 and label two points on the graph. Consider y = -2x 2 – 4x + 1 Enter the function as y= The window will show:
17
Example Graph the function f(x) = -2x 2 – 4x + 1 and label two points on the graph. The screen will show: The graph will look like this:
18
Example To find two points on the graph, press to find one and move the arrow key to find another one (or look at the table). The window will show: This gives you one ordered pair (0,1), move cursor to find another one or press 2 nd GRAPH see a table of values.
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.