Posted by trina on Monday, September 7, 2009 at 10:55am.
The choice of x vales to use depends very much on the question and what you are asked to show. It is quite usual to calculate the value for x=0. In this case where the function is a straight line you only really need to have values for x=-2 and x=8 and then draw the straight line between them.
Where the function is not a straight line then having several values helps to construct the line. It is usual to have both +ve and - values of x.
The question requires you to graph the three functions. The x-values given are suggested values, as explained by Dr. Russ.
Plot the functions graphically and you will be able to make observations and remarks.
Here's my version of the graph:
http://i263.photobucket.com/albums/ii157/mathmate/trina.png
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