Casio fx-991ZA Plus, User Manual

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(EQN) (a
n
X + b
n
Y = c
n
)
1 2 3
2 3 4
(X=) -1
(Y=) 2
Example 2:
x
-
y
+
z
= 2,
x
+
y
-
z
= 0, -
x
+
y
+
z
= 4
(EQN) (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
(Y=) 2
(Z=) 3
Example 3: 2 x
2
- 3 x - 6 = 0 (MthIO-MathO)
(EQN) (aX
2
+ bX + c = 0)
2 3 6
(X
1
=)
3 + √57
4
(X
2
=)
3 - √57
(X-Value Minimum=)*
3
4
(Y-Value Minimum=)*
57
8
* The local minimum value is displayed when a > 0. The local maximum
value is displayed when
a
< 0.
Example 4: x
2
- 2√2 x + 2 = 0 (MthIO-MathO)
(EQN) (aX
2
+ bX + c = 0)
1 2 2 2 (X=) √2
Example 5: x
3
- 2 x
2
- x + 2 = 0
(EQN) (aX
3
+ bX
2
+ cX + d = 0)
1 2 1 2
(X
1
=) -1
(X
2
=) 2
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