Casio fx 991MS User Guide - Page 27

Example - complex numbers

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• Any time until you input a value for the final coefficient (c2 for two unknowns, d3 for three unknowns), you can use the [ and ] keys to move between coefficients on the screen and make changes, if you want. • Note that you cannot input complex numbers for coefficients. Calculation starts and one of the solutions appears as soon as you input a value for the final coefficient. Variable name x= Arrow indicates direction you should scroll to 0. view other solutions. Solution Press the ] key to view other solutions. Use [ and ] to scroll between all of the solutions for the equation. Pressing the t key at this point returns to the coefficient input screen. • Example: To solve the following simultaneous equations 2x + 3y - z = 15 3x - 2y + 2z = 4 5x + 3y - 4z = 9 (x = 2, y = 5, z = 4) (Unknowns?) (a1?) ....... (d1?) (a2?) ....... (d2?) (a3?) ....... (d3?) (x = 2) (y = 5) (z = 4) 3 2 = 3 = D1 = 15 = 3 = D 2 = 2 = 4 = 5 = 3 = D 4 = 9 = ] ] 25

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25
• Any time until you input a value for the final coefficient
(
c
2
for two unknowns,
d
3
for three unknowns), you can
use the
[
and
]
keys to move between coefficients
on the screen and make changes, if you want.
•
Note that you cannot input complex numbers for coeffi-
cients.
Calculation starts and one of the solutions appears as soon
as you input a value for the final coefficient.
0.
x=
Solution
Variable name
Arrow indicates
direction you
should scroll to
view other
solutions.
Press the
]
key to view other solutions. Use
[
and
]
to scroll between all of the solutions for the equation.
Pressing the
t
key at this point returns to the coefficient
input screen.
•
Example:
To solve the following simultaneous equations
2
x
+ 3
y
–
z
= 15
3
x
– 2
y
+ 2
z
= 4
5
x
+ 3
y
– 4
z
= 9
(
x
=
2
,
y
=
5
,
z
=
4)
(Unknowns?)
3
(
a
1
?)
.......
(
d
1
?)
2
=
3
=
D
1
=
15
=
(
a
2
?)
.......
(
d
2
?)
3
=
D
2
=
2
=
4
=
(
a
3
?)
.......
(
d
3
?)
5
=
3
=
D
4
=
9
=
(
x
= 2)
]
(
y
= 5)
]
(
z
= 4)