Texas Instruments TI-84 PLUS - Graphing Calculator Manual Book page 307

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Begin by defining a function that describes
the volume of the box.
From the diagram:
2X + A = 20
2X + 2B = 25
V = A...B...X
Substituting:
V = (20 N 2X) (25à2 N X) X
1. Press o to display the
is where you define functions for tables
and graphing.
2. Press £
¹
„ ¤ £
20
2
^
~ ¹ „ ¤ „ Í to
1 2
define the volume function as
of
.
X
„ lets you enter
having to press ƒ. The highlighted
sign indicates that
Defining a Table of Values
The table feature of the TI-84 Plus displays numeric information about a function. You can use a
table of values from the function you just defined to estimate an answer to the problem.
1. Press y - to display the
menu.
SETUP
2. Press Í to accept
Í to define the table
3. Press
1
increment @
. Leave
Tbl=1
and
Depend: Auto
generated automatically.
4. Press y 0 to display the table.
Notice that the maximum value for
(box's volume) occurs when
between
and
.
3
5
editor, which
Y=
t
25
in terms
Y1
quickly, without
X
=
is selected.
Y1
TABLE
.
TblStart=0
Indpnt: Auto
so that the table will be
Y1
is about
,
X
4
X
A
20
X
B
X B
25
Chapter 17: Activities
300

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