Texas Instruments TITANIUM TI-89 - Manual (Page 98)

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Sequence Graphing Sequence Graphing Sequence Graphing Sequence Graphing
A small forest contains 4000 trees. Each year, 20% of the trees will be harvested (with
80% remaining) and 1000 new trees will be planted. Using a sequence, calculate the
number of trees in the forest at the end of each year. Does it stabilize at a certain
number?
5. Select ZoomSqr , which regraphs the
equation.
ZoomSqr increases the range along the
x axis so that the graph is shown in
correct proportion.
Press „ 5
You can change values for A and B as
necessary and regraph the equation.
Initially After 1 Year After 2 Years After 3 Years . . .
4000 .8 x 4000
+ 1000 .8 x (.8 x 4000 +
1000) + 1000 .8 x (.8 x (.8 x
4000 + 1000) +
1000) + 1000 . . .
Steps and keystrokes Display