Casio FX-991ES User Guide - Page 57

Equation Calculations

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Press this key: When you want to input this: 5(Not) "Not(" function, which returns the result of a bitwise complement 6(Neg) "Neg(" function, which returns the result of a two's complement • Negative binary, octal, and hexadecimal values are produced by taking the binary two's complement and then returning the result to the original number base. With the decimal number base, negative values are displayed with a minus sign. Appendix Examples through show examples of calculations with negative binary values and examples of logical operations. Before starting each calculation, be sure to press Ab first. Equation Calculations (EQN) All calculations in this section are performed in the EQN Mode (N5). k Equation Types An equation type menu appears when you press N5(EQN) and enter the EQN Mode. Key Menu Item 1 anX + bnY = cn 2 anX + bnY + cnZ = dn 3 aX2 + bX + c = 0 4 aX3 + bX2 + cX + d = 0 Equation Type Simultaneous Linear Equations with Two Unknowns Simultaneous Linear Equations with Three Unknowns Quadratic Equation Cubic Equation Changing the Current Equation Type Setting Press N5(EQN) to re-enter the EQN Mode. This clears all current EQN Mode input and displays the equation type menu described above. E-55

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E-55
Press this key:
When you want to input this:
5
(Not)
“Not(” function, which returns the result of a
bitwise complement
6
(Neg)
“Neg(” function, which returns the result of a
two’s complement
• Negative binary, octal, and hexadecimal values are produced by
taking the binary two’s complement and then returning the result
to the original number base. With the decimal number base,
negative values are displayed with a minus sign.
Appendix
Examples <#085> through <#090> show examples of calculations
with negative binary values and examples of logical operations.
Before starting each calculation, be sure to press
Ab
first.
Equation Calculations
(EQN)
All calculations in this section are performed in the EQN Mode
(
N
5
).
k
Equation Types
An equation type menu appears when you press
N
5
(EQN) and
enter the EQN Mode.
Key
Menu Item
Equation Type
Simultaneous Linear
1
a
n
X + b
n
Y = c
n
Equations with Two
Unknowns
Simultaneous Linear
2
a
n
X + b
n
Y + c
n
Z = d
n
Equations with Three
Unknowns
3
aX
2
+ bX + c = 0
Quadratic Equation
4
aX
3
+ bX
2
+ cX + d = 0
Cubic Equation
Changing the Current Equation Type Setting
Press
N
5
(EQN) to re-enter the EQN Mode. This clears all current
EQN Mode input and displays the equation type menu described
above.