Texas Instruments TI-89 Manual Do Utilizador
3D Graphing
403
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:
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
.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.
different eye angles.
This example shows
eye
eye
q
=70, eye
f
=70,
and eye
ψ
=0.
1 1
2
---
3
2
-------
+
1
2
2
---
3
2
-------
–
The zero is precise
when z=0.
when z=0.