Casio fx-115ES PLUS - Page 37

E-36
• A message appears to let you know when there is no solution or when
there are infinite solutions. Pressing A or = will return to the Coefficient
Editor.
Changing the Current Equation Type Setting
Press N5(EQN) and then select an equation type from the menu that
appears. Changing the equation type causes the values of all Coefficient
Editor coefficients to change to zero.
EQN Mode Calculation Examples
x + 2y = 3, 2x + 3y = 4
N5(EQN)1(a
n
X + b
n
Y = c
n
)
1 = 2 = 3 =
2 = 3 = 4 =
=
(X=) –1
c (Y=) 2
x – y + z = 2, x + y – z = 0, –x + y + z = 4
N5(EQN)2(a
n
X + b
n
Y + c
n
Z = d
n
)
1 =- 1 = 1 = 2 =
1 = 1 =- 1 =0 =
- 1 = 1 = 1 = 4 =
=
(X=) 1
c (Y=) 2
c (Z=) 3
2x
2
– 3x – 6 = 0 B
N5(EQN)3(aX
2
+ bX + c = 0)
2 =- 3 =- 6 ==
(X
1
=)
3 + 57
4
c (X
2
=)
4
3 – 57
c (X-Value Minimum=)*
3
4
c (Y-Value Minimum=)*
57
8
–
* The local minimum value is displayed when a  0. The local maximum value
is displayed when
a  0.
x
2
–
2
'
2
x + 2 = 0 B
N5(EQN)3(aX
2
+ bX + c = 0)
1 =- 2 ! 2 )= 2 ==
(X=)
'
2
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