Texas Instruments TI-89 Titanium User Manual

Activities 731
Finding the Minimum Surface Area Analytically
Perform the following steps to solve the problem analytically on the Home screen.
Running a Tutorial Script Using the Text Editor
This activity shows you how to use the Text Editor to run a tutorial script.
1. Solve for
x and y in terms of v.
Enter:
solve(d(sa(x,y,v),x)=0 and
d(sa(x,y,v),y)=0,{x,y})
2. Find the minimum surface area when the
value of
v equals 300.
Enter:
300!v
Enter:
sa(v^(1/3), v^(1/3),v)
Note:
Press ¸ to obtain the exact
result in symbolic form. Press 8¸ to
obtain the approximate result in decimal
form.

Texas Instruments TI-89 Titanium Specifications

General

Display Type	LCD
Display Resolution	160 x 100 pixels
CPU	Motorola 68000
CPU Speed	16 MHz
RAM	256 KB
Flash ROM	2.7 MB
Programming Language	TI-BASIC, Assembly
Power Source	4 AAA batteries
Connectivity	I/O port
Dimensions	7.5 x 3.5 x 1 inches