Casio fx-7400G PLUS Guide

A Resource for Free-standing Mathematics Qualifications Using the Casio fx-7400GPLUS
The Nuffield Foundation 1
Photo-copiable
Using the CASIO fx-7400G PLUS
CALCULATIONS
Use MENU 1 (RUN)
Negative Numbers Use the (–)button
Powers Use the ^button, including brackets if necessary
eg to find 20.05twhen tis 60, press 2 ^ ( 0.05 ×60 )
Exponential Function Use the exbutton (i.e. SHIFT ln)
eg to find e0.05twhentis 60, press ex( 0.05 ×60 )
Memories To recall/use the previous answer pressAns i.e. SHIFT(–).
To store a number in a memory, press→→ ALPHA A (or B, C, …) EXE
To recall/use pressALPHA A (or B, C, …)
TO DRAW THE GRAPH OF A FUNCTION
Use MENU 4 (GRAPH)
•To delete previous functions, press DEL (F2) then YES (F1).
•If you needto change the type of function,press and select from
Y= (for a function) or PARM (for points)
Pressing the arrow again allows you to choose inequalities
and pressing it again takes you back to the start.
•To draw the graph of a functionuse the X, T button for the variable (even if a
different letter is used). After entering the function, press EXE then DRAW (F4).
•To correct a mistake use or on the REPLY button to highlight the function,
then until you get to the error to over-write it.
•To keep a function in the memory, but stop it being drawnpress SEL (F1).
•To set co-ordinates for a good picture of the graph, press V-Window (SHIFT F3)
then enter the values you require for the axes. You will need to press EXE after
each entry anduse on the REPLAY button to get to the Y menu.
•To zoom in or out press Zoom (SHIFT F2), then IN (F3) or OUT (F4).
If you wishto change the scale factorfor zooming use FACT (F2).
To zoom in on a particular sectionof the graph press Box (F1), then use the
arrows on the REPLAY button to move the cursor to where you want one corner
of the box to be. Press EXE to set that corner, then use the arrows again to draw
the box. Press EXE again when the box is as you want it. The section of the
graph in the box will be enlarged to fill the screen.
To return to the original graph, press Zoom again then so that you can
select the ORIG (F1) option.
•To find thecoordinates of important points on a curve use Trace (SHIFT F1),
then the arrows on the REPLAY button. Press QUIT when you are finished.

A Resource for Free-standing Mathematics Qualifications Using the Casio fx-7400GPLUS
The Nuffield Foundation 2
Photo-copiable
TO FIND OUT HOW WELL A MODEL FITS DATA
Use MENU 4 (GRAPH) and the notes overleaf, using when necessary to find
theoptionsyou need.
•Use the PARM option toenter the points first.
•Then use the Y= option toenter the function.
•Press DRAW (F4) to plot the points and then the function.
TO FIND A FUNCTION TO MODEL DATA
Use MENU 2 (STAT)
•Enter the data values, pressing EXE after each value. There are 6 lists.
Press on the REPLAY button if you want to use lists 3, 4, 5 or 6.
•To delete previous values, press then DEL A (F2) to delete a whole list
and DEL (F1) to delete just the highlighted value.
•To choose which lists the graph will use, press GRPH (F1)then
then SET (F4). The display will show the set-up for Graph 1.
Use on the REPLAY button to scroll down.
Check that the G-Type is Scat (if it isn’t, press F1).
Use the F buttons to choose lists for the X and Y values on the graph.
The Freq should be set to 1.
M-type gives you a choice of different markers for the points.
If you want to select lists for another graph, highlight StatGraph1 at the top of the
list, then use the F buttons to select another graph.
Finally press EXE or QUIT to return to the lists.
•To draw a graph of the points press GPH1 (F1) or one of the other F buttons.
•To find a model
Press X (F1) for a linear function or X^2 (F3) for a quadratic function.
Press then one of the F buttons for other options.
eg Exp (F2) gives the bestexponential function to model the data.
Note that the givenrvalue is a measure of how closely the function fits the data.
A value of 1 or – 1 means the function is an exact fit.
Press DRAW (f4) todraw the graph of the function over the points.
Press QUIT to go back to the lists.