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Casio fx-991ES PLUS User Manual

Casio fx-991ES PLUS
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(SOLVE)
(1) Prompts for input of a value for Y
(2) Current value of Y
0 1 2
(3) Current value of X
Input an initial value for X (Here, input 1):
1
Solution Screen
To exit SOLVE:
Note
During the time from when you press (SOLVE) until you exit SOLVE by
pressing , you should use Linear Display input procedures for input.
Important!
Depending on what you input for the initial value for X (solution variable), SOLVE may
not be able to obtain solutions. If this happens, try changing the initial value so they
are closer to the solution.
SOLVE may not be able to determine the correct solution, even when one exists.
SOLVE uses Newton's method, so even if there are multiple solutions, only one of
them will be returned.
Due to limitations in Newton's method, solutions tend to be difficult to obtain for
equations like the following: y = sin(x), y = e
x
, y = √x.
Solution Screen Contents
Solutions are always displayed in decimal form.
39

Table of Contents

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Casio fx-991ES PLUS Specifications

General IconGeneral
TypeScientific
CoverNo
Form factorDesktop
Control typeButtons
Product colorGray
Digits15 digits
Display typeDot-matrix
Display resolution96 x 31 pixels
Display number of lines10 lines
Storage media typeNot available
Battery life3 year(s)
Battery typeLR44
Power sourceBattery/Solar
Number of batteries supported1
Symbolic notationSquare root
Conversion betweenDecimal, Fraction, Percent
Convert angles from degrees toGradian, Radian
Random number/integer generatorYes
Weight and Dimensions IconWeight and Dimensions
Depth162 mm
Width80 mm
Height11.1 mm
Weight95 g

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