Chapter 7: Tables
115
Chapter 7:
Tables
Getting Started: Roots of a Function
Getting Started is a fast-paced introduction. Read the chapter for details.
Evaluate the function Y = X
3
N
2X at each integer between
L
10 and 10. How many sign changes
occur, and at what X values?
1. Press
z † † † Í
to set
Func
graphing
mode.
2. Press
o
. Press
„
3
to select
3
. Then
press
¹
2
„
to enter the function
Y1=X
3
N
2X
.
3. Press
y -
to display the
TABLE SETUP
screen. Press
Ì
10
Í
to set
TblStart=
L
10
.
Press
1
Í
to set
@
Tbl=1
.
Press
Í
to select
Indpnt: Auto
(automatically
generated independent values). Press
† Í
to
select
Depend: Auto
(automatically generated
dependent values).
4. Press
y 0
to display the table screen.
Note
: The message on the entry line, “Press + for
@
Tbl” is a reminder that you can change
@
Tbl from
this table view. The entry line is cleared when you
press any key.
5. Press
†
until you see the sign changes in the
value of
Y1
. How many sign changes occur, and at
what X values?
In this case, you can also see the roots of the
function by finding when Y1=0. You can explore
changes in X by pressing
Ã
to display the
@T
Tbl
prompt, entering a new value, and searching for
your answer.
