1. Create a new document, select Add Graphs.
2. Enter your function after f1(x)=. Then, press .

   

Tip 1: Make sure only the functions you are using are displayed. To deactivate/activate a function’s display, select , go to the function you want to activate/deactivate, and check/uncheck the square.

1. Choose an appropriate window. Press and select Window/Zoom > Window Settings. Enter appropriate values for Xmin, Xmax, Ymin, and Ymax. Choose an XScale approximately twenty times smaller than the gap between Xmin and Xmax. Usually, we set XScale to powers of 10.
2. Choose Ymin and Ymax to be slightly beyond the range of your desired y-values. If you do not know which y-values to choose, press and select Window/Zoom > Zoom - Fit to make the y-values graph pretilly. It should display this:

   

3. To display a specific part of the graph (here: the first local minimum), press and select Window / Zoom > Zoom - Box. and select Use the arrows to move to a point on the screen that you want the top left corner of the screen to be, and press

   

4. If you wish to zoom out in order to zoom in to another part of the graph, press , select Window / Zoom > Zoom - Out.

1. Enter the two functions after f1(x)= and f2(x)=.
2. Enter a third function f3(x)=f1(x)+f2(x). Uncheck f1(x) and f2(x). Press . The sum of the two functions is displayed.

   

The same procedure can be used for subtraction, multiplication, or division of two functions.