Texas Instruments Titanium TI-89, User Manual

Page: 392 / 977

3D Graphing 389
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:
L
,
i
, and
i
4. Display the Graph Formats dialog box:
8
Í
Turn on the axes, set
Style = CONTOUR LEVELS
, and return to
the Window editor.
6. Press
…
, and move the trace cursor to
the zero in the fourth quadrant.
The coordinates let you estimate
.428–.857
i
as the zero.
7. Press
N
. Then use the cursor keys to
animate the graph and view it from
different eye angles.
This example shows
eye
q
=70, eye
f
=70,
and eye
ψ
=0.
1 1
2
---
3
2
-------
+
1
2
---
3
2
-------
–
The zero is precise
when z=0.