Operation Manual

Chapter 17: Activities 300
Setting the Viewing Window
You also can use the graphing features of the TI-84 Plus C to find the maximum value of a previously
defined function. When the graph is activated, the viewing window defines the displayed portion of
the coordinate plane. The values of the window variables determine the size of the viewing window.
7. Press † or } to move the cursor to
3.67.
Press ~ to move the cursor into the
Y1
column.
The value of Y1 at X=3.67 is displayed on
the bottom line in full precision as
410.261226.
8. Press † to display the other maximum.
The value of
Y1 at X=3.68 in full precision
is 410.264064, at X=3.69 is 410.262318 and
at
X=3.7 is 410.256.
The maximum volume of the box would
occur at 3.68 if you could measure and cut
the paper at 01-centimeter increments.
1. Press p to display the window editor,
where you can view and edit the values of
the window variables.
The standard window variables define the
viewing window as shown.
Xmin, Xmax,
Ymin, and Ymax define the boundaries of
the display. Xscl and Yscl define the
distance between tick marks on the
X and
Y axes. Xres controls resolution.
2. Press
0 Í to define Xmin.
3. Press
20 ¥ 2 to define Xmax using an
expression.
Note: For this example, the division sign is
used for the calculation. However, you can
use n/d entry format where fraction output
can be experienced, depending on mode
settings. n/d is not valid for complex
numbers.