Casio fx-991EX User Manual

fx-991EX Quick Start Guide40
The fx-991EX numerically solves equations elegantly. It is accomplished with the help of the Natural Textbook
Display™ in the Equation/Func mode. The Equation/Func mode uses Newton’s method to nd solutions to equations.
The fx-991EX has the power to handle Simultaneous Equations with up to 4 unknowns and Polynomial Equations up
to the 4th degree.
SIMULTANEOUS EQUATIONS
From the Main Menu, use the arrow keys to highlight the
Equation/Func icon and press p or press z(A).
To solve the following system of simultaneous equations
,
select 1(Simul Equation).
Choose the number of Unknowns. For this example,
press 2(Unknowns).
A 2x2 system of equations template is displayed. The template is
in Ax + BY = C form in which A, B and C can be any value. For
fractional values, use the a key.
Type in each value followed by the p key.
Press 2p1p, etc.
EQUATION/FUNC

Casio fx-991EX Specifications

General

Type	Scientific
Cover	No
Form factor	Pocket
Control type	Buttons
Product color	Black, White
Battery type	LR44
Power source	Battery/Solar
Number of batteries supported	1
Digits	16 digits
Display type	LCD
Display resolution	192 x 63 pixels
Display number of lines	2 lines
Display number of characters	16
Storage media type	-
Operation	552
Conversion between	Decimal, Fraction, Percent
Convert angles from degrees to	Gradian, Radian
Random number/integer generator	Yes

Weight and Dimensions

Depth	165.5 mm
Width	77 mm
Height	11.1 mm
Weight	90 g