Texas Instruments TI-89 Manual Book page 420

Note: Calculating and
drawing the graph takes
about three minutes.
Summary
6. In the Y=Editor, press:
¥ Í
TI-89:
¥
TI-92 Plus: F
and set the Graph Format
variables to:
Axes= ON
Labels= ON
Style= HIDDEN SURFACE
7. Graph the modulus surface.
The 3D graph is used to
visually display a picture of the
roots where the surface
touches the xy plane.
8. Use the Trace tool to explore
the function values at
.
y=0
9. Use the tool to explore
Trace
the function values at
.
y=1
10. Use the tool to explore
Trace
the function values at
y=ë 1 .
Note that zc is zero for each of the function values in steps 7–9. Thus,
the complex zeros 1,ë i, i of the polynomial
visualized with the three points where the graph of the modulus
surface touches the xy plane.
and
x=1
and
x=0
and
x=0
xò ì xñ +xì 1
Chapter 23: Activities
can be
403