User manual - fx-5800P

E-71
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Selecting an Equation Type
The following shows the operations you can use to select an equation type.
To select this equation type:
Perform this key
operation:
EQN type menu item:
Simultaneous Linear Equations
with Two Unknowns
N
8
(EQN)
1
aX+bY=c
Simultaneous Linear Equations
with Three Unknowns
N
8
(EQN)
2
aX+bY+cZ=d
Simultaneous Linear Equations
with Four Unknowns
N
8
(EQN)
3
aX+bY+cZ+dT=e
Simultaneous Linear Equations
with Five Unknowns
N
8
(EQN)
4
aX+bY+cZ+dT+eU=f
Quadratic Equation
N
8
(EQN)
c
1
aX
2
+bX+c=0
Cubic Equation
N
8
(EQN)
c
2
aX
3
+bX
2
+cX+d=0
Note
Changing the equation type after you are already using the EQN Mode to perform a
calculation will cause all values currently input on the coeffi cient editor screen to be cleared.
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Inputting Values for Coeffi cients
Use the coeffi cient editor for inputting values for the coeffi cients of an equation. The
coeffi cient editor screen has cells that you can use to input values for each coeffi cient. The
number of cells that appear on the coeffi cient editor screen depends on the equation type
you selected.
A
Inputting and Editing Coeffi cient Values
• Use the cursor keys to move the cursor to the cell you want and then input a value. As you
input a value or expression, it appears in the lower left corner of the display.
• To clear the contents of the cell where the cursor is currently located, press
o
.
• You must press
E
to fi nalize input into the cell where the cursor is located. This will
register your input and move the cursor to the next cell. Up to six digits of the input value
will be displayed in the cell when you press
E
.
• You can input a value or calculation expression into each cell. If you input a calculation
expression, pressing
E
will execute the calculation and display only the result in the
applicable cell.
• To edit the contents of a cell, use the cursor keys to move the cursor to the cell and then
input what you want.