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TI-83 Plus Activities 544
The Quadratic Formula
Displaying Complex Results
Now solve the equation 2X
2
N
X + 3 = 0. When you set
a+b
i
complex
number mode, the TI-83 Plus 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
5
(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.