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Casio fx-991ES PLUS User Manual

Casio fx-991ES PLUS
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(CMPLX)
(A) (B) (i)
(CMPLX) ( rθ)
3 1 230
(or ) 1 3 260
To exit CALC:
Note
During the time from when you press until you exit CALC by pressing , you
should use Linear Display input procedures for input.
Using SOLVE
SOLVE uses Newton's method to approximate the solution of equations.
Note that SOLVE can be used in the COMP Mode only.
The following describes the types of equations whose solutions can be
obtained using SOLVE.
Equations that include variable X: X
2
+ 2X - 2, Y = X + 5, X = sin(M),
X + 3 = B + C
SOLVE solves for X. An expression like X
2
+ 2X - 2 is treated as X
2
+ 2X
- 2 = 0.
Equations input using the following syntax: {equation}, {solution
variable}
SOLVE solves for Y, for example, when an equation is input as: Y = X +
5, Y
Important!
If an equation contains input functions that include an open parenthesis (such as sin
and log), do not omit the closing parenthesis.
The following functions are not allowed inside of an equation: , d/dx, Σ, Pol, Rec.
Example: To solve y = ax
2
+ b for x when y = 0, a = 1, and b = -2
(Y) (=)
(A) (X) (B)
38

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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