32 Chapter 2: Documenting Polynomial Zero Finding
When you don’t like the change of the aspect ratio such is in the above pictures, you can easily
restore it. You will learn how to do this in Chapter 4.
Insert a text object documenting the method and result of your findings.
Insert a new text object and enter the following text (use the numbers you found):
Search for more zeros: Make the plot window active, then move the square to the uncertain
middle section.
You will find that there is one zero between -0.62 and -0.6. Another zero seems to be at exactly
x=-0.5. To obtain a picture with intersections of the graph, magnify again.
Zoom in, this time using the
Zoom in
button twice.
It becomes obvious that there are two zeros. Continue to magnify the graph.
Zooming in once more with
lets the square leave the plot window because follow mode is
switched off (left picture). The very useful
Center on cross
button shifts the plot range
so that the square/cross is in the center of the new plot image.
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