Texas Instruments TI-84 Plus Guide Book

Chapter 2: Math, Angle, and Test Operations 73
On the TI-84 Plus, complex numbers can be stored to variables. Also, complex numbers
are valid list elements.
In Real mode, complex-number results return an error, unless you entered a complex
number as input. For example, in Real mode
ln(L1) returns an error; in a+bi mode ln(L1)
returns an answer.
Entering Complex Numbers
Entering Complex NumbersEntering Complex Numbers
Entering Complex Numbers
Complex numbers are stored in rectangular form, but you can enter a complex number
in rectangular form or polar form, regardless of the mode setting. The components of
complex numbers can be real numbers or expressions that evaluate to real numbers;
expressions are evaluated when the command is executed.
Note about Radian Versus Degree Mode
Note about Radian Versus Degree ModeNote about Radian Versus Degree Mode
Note about Radian Versus Degree Mode
Radian mode is recommended for complex number calculations. Internally, the TI-84
Plus converts all entered trigonometric values to radians, but it does not convert values
for exponential, logarithmic, or hyperbolic functions.
Real mode
a+bi mode
$$

Texas Instruments TI-84 Plus Specifications

General

Battery type	AAA
Power source	Battery
Number of batteries supported	4
Type	Graphing
Cover	No
Form factor	Pocket
Control type	Buttons
Product color	Black
USB port	Yes
USB 2.0 ports quantity	1
Digits	- digits
Display number of lines	8 lines
Display number of characters	16
RAM capacity	0.024 MB
ROM capacity	0.480 MB
Storage media type	-