I. Menu Keys - Keys that offer choices


For most of the calculations you perform, you will use the MODE window shown in the figure below. Changes in the MODE are used primarily in trigonometry and in cases when you want to change the display.

To change the mode, move the cursor over the selection you want, and then press . To return to the home screen, press .

1. Normal Sci Eng

For most of your calculations you will leave the mode in Normal. This expresses the number with digits to both the left and right of the decimal point. If the number is too large to be shown in normal mode, the calculator will automatically switch to scientific notation.

Sci (scientific) and Eng (engineering) notation will express the answer as a power of 10. Scientific will have only one digit left of the decimal, but engineering may have up to three digits left of the decimal with the exponent being a multiple of 3.

Example: Express the number 123,456,789.001 in each mode.


2. Float 0123456789

This will set the number of digits to be displayed.

Float will display up to 10 digits plus the sign and the decimal. If you select one of the other numbers, that number will be the number of digits that will be shown to the right of the decimal for all calculations. Unless there is some particular reason for doing otherwise, you should leave the setting on float.

3. Radian Degree

These are mode settings used in trigonometry and when using trig functions in calculus. These settings only affect calculations or graphs involving trigonometric functions. They will have no effect on other calculations or graphs.

It is essential that you have the correct mode because the results will be very different in each mode. If you try to graph a trig function with the degree mode selected but the graph window set with radian measurements, you will get a result much like that shown below. However, if you use ZTrig it will automatically set the window to the selected mode.

Example: Graph the function y=sin x with the mode set in degree but the window set to [Xmin,Xmax]=. Then use ZTrig to get the correct graph.

Change the mode.
Enter the function.
Set the window.
Incorrect graph.
Use ZTrig.
Correct graph.

4. Func Par Pol Seq

These are graphing modes. The selection will also determine which symbol is used when you use the key. However, the symbol that is used does not affect the calculations.

Func (function) mode is the mode you will use most often. It is the mode for any function that is to be graphed with rectangular coordinates (y is a function of x).

Par (parametric) mode defines both X and Y as a function of the variable T.

Pol (polar) mode plots functions that are polar form. The function r is a function of . You will use this mode is some algebra applications, but you will primarily use this mode in calculus. To use the TRACE in this mode you should change to polar graphing coordinates.

Seq (sequence) mode will plot a sequence. This is a calculus application.

Enter a function.
Graph and hit
and move the cursor.
Hit in
the home screen.

5. Connected Dot

This determines whether a graph is plotted with the points connected to produce a smooth curve or if just each point is plotted. It is easier, however, to set the style for each graph separately and to leave this in Connected mode.

6. Sequential Simul

If you have more than one function entered to graph you can select Sequential to have the graphs rendered one at a time or Simul (simultaneous) to have all the functions graphed at one time.

7. Real a+bi

You will most likely use only the Real mode. The other modes are rectangular mode, complex mode, and polar complex mode that are rarely used in algebra or trigonometry.

8. Full Horiz G-T

These determine the view that you see on the screen.

Full mode shows only one thing at a time: one graph, just the table, only the home screen, etc.

Horiz (horizontal) mode shows the graph screen and either the home screen or an editor on the bottom half.

G-T mode will display a graph and the table.