Texas Instruments TI-89 Titanium User Manual page 392

4. Display the Graph Formats dialog box:
8 Í Turn on the axes, set
Style = CONTOUR LEVELS
the Window editor.
5. Press 8 % to graph the equation.
It will take awhile to evaluate the graph; so be patient. When the graph is displayed,
the complex modulus surface touches the xy plane at exactly the complex zeros of
the polynomial:
1 3
L , + , and
1 -- - ------ -
i
2 2
6. Press ..., and move the trace cursor to
the zero in the fourth quadrant.
The coordinates let you estimate
.428–.857 as the zero.
i
7. Press N. Then use the cursor keys to
animate the graph and view it from
different eye angles.
3D Graphing
, and return to
1 3
–
-- - ------ -
i
2 2
The zero is precise
when z=0.
This example shows
eye q =70, eye f =70,
ψ
and eye =0.
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