Entering Complex Numbers - Texas Instruments TI-89 Manual Book

Entering Complex Numbers

Overview of
Complex Numbers
Note: To get the i symbol,
press 2 ) , do not
simply type an alphabetic i.
You can enter complex numbers in the polar form (rq), where
r is the magnitude and q is the angle, or polar form r
can also enter complex numbers in rectangular form a+b
A complex number has real and imaginary components that identify
a point in the complex plane. These components are measured along
the real and imaginary axes, which are similar to the x and y axes in
the real plane.
The point can be expressed in
rectangular form or in either of
two polar forms.
The i symbol represents the
À
imaginary number L1 .
As shown below, the form that you can enter depends on the current
mode.
Angle
You can use the form:
a+bi
i q
r e
(rq)
Use the following methods to enter a complex number.
To enter the:
Rectangular form
a+bi
Imaginary
a
r
When the Angle mode setting is:
or
Radian Degree
Radian only
(In angle mode, this form causes a
Degree
Domain error .)
or
Radian Degree
Do this:
Substitute the applicable values or variable
names for a and b .
a « b 2 )
For example:
Appendix B: Reference Information
i q
e . You
i
Expressed as
i q
a+bi, r e , or
(rq)
b
Real
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