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24 Using the Scratchpad
• The string undef is displayed instead of a value when you move over a point
that is not defined for the function (a discontinuity).
• When you trace beyond the initially visible graph, the screen pans to show the
area being traced.
4. Press d or choose another tool to exit Graph Trace.
Finding Points of Interest
You can use the tools on the Analyze Graph menu to find a point of interest in a
specified range of any graphed function. Choose a tool to find zero, the minimum or
maximum, the point of intersection or inflection, or the numeric derivative (dy/dx) or
Integral on the graph.
1. Select the point of interest that you want to find on the Analyze Graph menu. For
example, to find a zero, press b 6 1.
non-CAS and
Exact Arithmetic
CAS
Zero
b 6 1 b 6 1
Minimum
b 6 2 b 6 2
Maximum
b 6 3 b 6 3
Intersection
b 6 4 b 6 4
Inflection Not applicable
b 6 5
dy/dx
b 6 5 b 6 6
Integral
b 6 6 b 6 7
Analyze Conics
b 6 7 b 6 8
The icon for the selected tool is displayed at the top left on the work area. Point to
the icon to view a tooltip about how to use the selected tool.
2. Click the graph you want to search for the point of interest, and then click a second
time to indicate where to start the search for the point.
The second click marks the lower bound of the search region and a dotted line is
displayed.
Note: If you are finding the derivative (dy/dx), click the graph at the point (numeric
value) to use for finding the derivative.
3. Press ¡ or ¢ to move the dotted line that marks the search region, and then click
the point at which you want to stop the search (upper bound of the search region).
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