HP HP-15C User Manual

128 Section 11: Calculating With Complex Numbers
Re
Im
Re
Im
Re
Im
Re
Im
T
a
b
a
b
a
b
a
b
Z
c
d
c
d
c
d
c
d
Y
e
f
e
f
e
f
e
f
X
7
8
0
8
9
8
17
144
Keys:
−
9
| x
Entering a Real Number
You have already seen two ways of entering a complex number. There is a
shorter way to enter a real number: simply key it (or recall it) into the
display just as you would if the calculator were not in Complex mode. As
you do so, a zero will be placed in the imaginary X-register (as long as the
previous operation was not − or `, as explained on page 124).
The operation of the real and imaginary stacks during this process is
illustrated below. (Assume the last key pressed was not − or ` and
the contents remain from the previous example.)
Re
Im
Re
Im
Re
Im
T
a
b
c
d
e
f
Z
c
d
e
f
17
144
Y
e
f
17
144
4
0
X
17
144
4
0
4
0
Keys:
4
v
(Followed by
another number.)

HP HP-15C Specifications

General

Brand	HP
Model	HP-15C
Category	Calculator
Language	English