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Nonlinear Absolute Values

Equations can contain terms that possess exponents and that are also absolute values. The graph of such an equation in some ways resembles the graph of a linear equation that possesses an absolute value because the values you plot for the y axis are all positive, while those you plot for the x axis are both negative and positive. Here is an example of an equation that requires you to plot the absolute value of the cube of x:

y = |x3|

As the graph on the right in Figure 10.13 illustrates, when you do not designate the absolute value of a cube, an equation with a cube can generate negative numbers. This is so because an expression such as –x · –x · –x renders a negative product. The graph of an equation involving a cube ...

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