Casio fx-9860GII - 1.10 Conjugate, modulus and argument; 1.11 Solving equations with complex roots

Using a graphic display calculator
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Casio fx-9860GII
1.10 Conjugate, modulus and argument
Example 13
Let
zi=+13
Find
i z
∗
ii |z| iii arg (z)
Press
MENU
. You will see the dialog box as shown on the right.
Choose 1: RUN·MAT and press
EXE
.
i Press
OPTN
|
F3
CPLX |
F4
Conj
Enter the complex number in brackets. To enter the imaginary number
symbol i press
F1
i.
Press
EXE
ii Press
OPTN
|
F3
CPLX |
F2
Abs
Enter the complex number. To enter the imaginary number symbol i
press
F1
i.
Press
EXE
iii Press
OPTN
|
F3
CPLX |
F3
Arg
Enter the complex number in brackets.
To enter the imaginary number symbol i press
F1
i.
Press
EXE
1.11 Solving equations with complex roots
Example 14
Solve the equation 2x
3
− 15x
2
+ 44x − 39 = 0
Press
MENU
. You will see the dialog box as shown on the right.
Choose A: EQUA and press
EXE
.
Press
SHIF T
SET UP
Select a + bi as the Complex mode
Press
EXIT
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