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8 Getting Started
8300GETM.DOC TI-83 international English Bob Fedorisko Revised: 02/19/01 11:06 AM Printed: 02/19/01 11:06
AM Page 8 of 18
Now solve the equation 2X
2
N
X + 3 = 0. When you set a+b
i
complex number
mode, the TI
.
83 displays complex results.
1. Press
z
†
†
†
†
†
†
(6 times), and
then press
~
to position the cursor over
a+b
i
. Press
Í
to select
a+b
i
complex-
number mode.
2. Press
y
[
QUIT
] (above
z
) to return to
the home screen, and then press
‘
to
clear it.
3. Press 2
¿
ƒ
[
A
]
ƒ
[
:
]
Ì
1
¿
ƒ
[
B
]
ƒ
[
:
] 3
¿
ƒ
[
C
]
Í
.
The coefficient of the X
2
term, the
coefficient of the X term, and the constant
for the new equation are stored to A, B,
and C, respectively.
4. Press
y
[
ENTRY
] to recall the store
instruction, and then press
y
[
ENTRY
]
again to recall the quadratic-formula
expression,
−
−−
bb ac
a
2
4
2
5. Press
Í
to find one solution for the
equation 2X
2
N
X + 3 = 0.
6. Press
y
[
ENTRY
] repeatedly until this
quadratic-formula expression is displayed:
−
+−
bb ac
a
2
4
2
7. Press
Í
to find the other solution for
the quadratic equation: 2X
2
N
X + 3 = 0.
Note:
An alternative for solving equations for real numbers is to use the built-in Equation
Solver (Chapter 2).
Displaying Complex Results: The Quadratic Formula