Texas Instruments Titanium TI-89 User Manual

Activities 767
3. Use the abs( ) function to find the absolute
value of
f(x+yi).
(This calculation may take about 2
minutes.)
Note: The absolute value of a function
forces any roots to visually just touch
rather than cross the
x axis. Likewise, the
absolute value of a function of two
variables will force any roots to visually
just touch the
xy plane.
4. Copy and paste the last answer to the
entry line and store it in the function
z1(x,y).
Note: The graph of z1(x,y) will be the
modulus surface.
5. Set the unit to 3D graph mode, turn on the
axes for graph format, and set the
Window variables to:
eye= [20,70,0]
x= [
L2,2,20]
y= [
L2,2,20]
z= [
L1,2]
ncontour= [5]

Texas Instruments Titanium TI-89 Specifications

General

Display Type	LCD
Display Resolution	160 x 100 pixels
Memory	188 KB RAM, 2.7 MB Flash ROM
Type	Graphing Calculator
Display	Monochrome
Processor	Motorola 68000
Processor Speed	12 MHz
Power Source	4 AAA batteries
Connectivity	USB
Programming	TI-BASIC, Assembly
Operating System	AMS (Advanced Mathematics Software)