Operation Manual

Chapter 17: Activities 298

Defining a Table of Values

The table feature of the TI-84 Plus C 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 o to display the

Y= editor.

2. Press £

20 ¹ 2 „ ¤ ä £ t ^ 1

~ 2 ¹ „ ¤ „ Í to define

the volume function as Y1 in terms of X.

„ lets you enter X quickly, without

having to press ƒ. The highlighted =

sign indicates that

Y1 is selected.

1. Press y - to display the

TABLE SETUP menu.

2. Press Í to accept TblStart=1.

3. Press

1 Í to define the table increment

Tbl=1. Leave Indpnt: Auto and

Depend: Auto so that the table will be

generated automatically.

4. Press y 0 to display the table.

Notice that the maximum value for

(box’s volume) occurs when X is about 4,

between

3 and 5.

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