Education Technology

Solution 30531: Finding the Inverse of a Function on the TI-89 Family, TI-92 Family and Voyage™ 200 Graphing Calculators.

How do I find the inverse of a function on a TI-89 Family, TI-92 Family and Voyage 200 calculator?

For example, if you need to find the inverse of f(x)=5/x+10 follow the steps listed below.

1) On a sheet of paper, replace x with y, and replace f(x) with x
2) Your equation should now be x=5/y+10
3) Solve for y using your calculator by pressing: [F2] [ENTER] [x] [=] [5] [/] [y] [+] [1] [0] [,] [y] [)]

So, f-1(x)=5/(x-10)

Please see the TI-89 family, TI-92 family and Voyage 200 guidebooks for additional information.