Texas Instruments TI-82 Getting Started page 28

Figure I.80:
Now enter the 3 1 matrix
solution matrix (Figure I.81). The solution is still
I.7 Sequences
I.7.1 Iteration with ANS Key: The ANS feature permits you to perform iteration, the process of evaluating
a function repeatedly. As an example, calculate
to the previous calculation. Continue to use each answer as
accomplish this iteration on TI-82 calculator (see the results in Figure I.82). Notice that when you use ANS
in place of n in a formula, it is sufficient to press ENTER to continue an iteration.
Iteration
1
2
3
4
5
Press ENTER several more times and see what happens with this iteration. You may wish to try it again with
a different starting value.
I.7.2 Terms of Sequences: Another way to display the terms of a sequence is to enter the sequence and the
number of terms you want listed. For example, to find the first five terms of the sequence
press 2nd LIST 5 [seq( ] (-) ALPHA N + 4, ALPHA N , 1 , 5 , 1 ) ENTER (see Figure I.83). The format
of this command is seq(expression, variable, begin, end, increment ).
I-28
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A A -1
and
9
B . Then press MATRX 1
4 as
17
x 1,
n 1
for
3
Keystrokes
27 ENTER
( 2nd ANS 1 )
ENTER
ENTER
ENTER
Figure I.82: Iteration
Figure I.81: Solution matrix
-1
x MATRX 2 ENTER to calculate the
y 1, and z 2.
n 27. Then calculate
n in the next calculation. Here are keystrokes to
Display
3 ENTER
8.666666667
2.555555556
.5185185185
-.1604938272
TI-82 Graphics Calculator
n 1
for n the answer
3
27
u n 4,
n