Using the TI-85 graphing calculator, give numerical evidence to evaluate

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- Enter the function:
**Y = (x^2-1)/(x^2+1)**and press the ENTER key. - Press 2nd MATH and pick
**MISC**by pressing F5. - Press F3 to enter
**seq**. Continue to enter the command:**seq(10^I, I, 0, 10, 1) STO x**and press the ENTER key.

- This creates a list of
**x**-values:**{1 10 100 1000 ... 10000000000}**which are the powers,

**10**, for^{I}**I = 0, 1, ..., 10**. - Press the EXIT key twice.
- Type
**Y**and press the ENTER key. On the screen you will then see the list of corresponding**y**-values using the function you entered above:I x Y 0 1 0 1 10 .980198019802 2 100 .999800019998 3 1000 .999998000002 4 10000 .99999998 5 100000 .9999999998 6 1000000 .999999999998 7 10000000 1 8 100000000 1 9 1000000000 1 10 1000000000 1 It appears that the limit is

**1**. - If you want to round the numbers to fewer decimal places, press the
2nd MATH key again followed by F1 to pick
**NUM**. - Press F1 to pick
**round**and complete the command**round(2nd ANS, 4)**and press the ENTER key to round to four decimal places.