Unformatted text preview: g functions. If we recall from the previous section we said that
f ( x ) is nothing more than a fancy way of writing y. This means that we already know how to
graph functions. We graph functions in exactly the same way that we graph equations. If we
know ahead of time what the function is a graph of we can use that information to help us with
the graph and if we don’t know what the function is ahead of time then all we need to do is plug
in some x’s compute the value of the function (which is really a y value) and then plot the points. Example 1 Sketch the graph of f ( x ) = ( x - 1) + 1 .
Now, as we talked about when we first looked at graphing earlier in this chapter we’ll need to
pick values of x to plug in and knowing the values to pick really only comes with experience.
Therefore, don’t worry so much about the values of x that we’re using here. By the end of this
chapter you’ll also be able to correctly pick these values.
Here are the function evaluations.
x f(x) -1 -7 0 0 1 1 2 2 3 9 ( x, y )
( -1, -7 )
( 0, 0 )
( 2, 2 )
( 3,9 ) Here is the sketch of the graph. So, graphing functions is pretty much the same as graphing equations. © 2007 Paul Dawkins 186 http://tutorial.math.lamar.edu/terms.aspx College Algebra...
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This note was uploaded on 06/06/2012 for the course ICT 4 taught by Professor Mrvinh during the Spring '12 term at Hanoi University of Technology.
- Spring '12