Casio fx-9860GII User Manual

Using a graphic display calculator
© Oxford University Press 2012: this may be reproduced for class use solely for the purchaser’s institute
Casio fx-9860GII
Example 34
Find the values of x on the curve
yxx
x
=+−+
3
2
3
51
where the gradient is 3.
Press
MENU
. You will see the dialog box as shown on the right.
Choose 5: GRAPH and press
EXE
.
Press
OPTN
F2
CALC.
Choose
F1
d
dx
to choose the derivative template.
In the template enter x, the function
x
xx
3
2
3
51+−+
and the value x.
Press
EXE
.
Press
SHIF T
F3
V-Window and choose STD for the default axes
which are −10 ≤ x ≤ 10 and −10 ≤ y ≤ 10.
Press
EXE
and
F6
DRAW.
The calculator displays the graph of the numerical derivative
function of
yxx
x
=+−+
3
2
3
51
.
Press
EXIT
to display the Y= editor.
Enter the function Y
2
= 3.
Press
F6
DRAW.
The calculator now displays the curve and the line y = 3.
To fi nd the points of intersection between the curve and the line:
Press
SHIF T
F5
G-Solv.
Press
F5
ISCT.
The GDC shows a point of intersection at (4, 3).
{ Continued on next page
33

Casio fx-9860GII Specifications

General

Type	Graphing
Form factor	Desktop
Control type	Buttons
Product color	Silver
Housing material	Plastic
Built-in capability	Yes
Digits	- digits
Display type	LCD
Second display	No
Display tilting	-
Display resolution	64 x 128 pixels
Display character size	8 x 21 mm
Display number of lines	8 lines
Display number of characters	21
Flash memory	1.5 MB
RAM capacity	0.064 MB
Storage media type	Flash
Battery type	AAA
Power source	Battery
Number of batteries supported	4