HP 15c User Manual
Page 127
Section 11: Calculating With Complex Numbers 127
Entering Complex Numbers with −. The clearing functions − and
` can also be used with } as an alternative method of entering
(and clearing) complex numbers. Using this method, you can enter a
complex number using only the X-register, without affecting the rest of the
stack. (This is possible because − and ` disable stack lift.)
Executing } will also create an imaginary stack if one is not already
present.
Example: Enter 9 + 8i without moving the stack and then find its square.
Keystrokes
Display
(
−)
(0.0000)
Prevents stack lift when the
next digit (8) is keyed in.
Omit this step if you'd rather
save what's in X and lose
what's in T.
8
8
Enter imaginary part first.
´ }
7.0000
Displays real part; Complex
mode activated.
−
0.0000
Disables stack. (Otherwise, it
would lift following }.)
9
9
Enters real part (digit entry not
terminated).
| x
17.0000
Real part.
´ % (hold)
(release)
144.0000
Imaginary part.
17.0000
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
4
7
0
7
8
7
7
8
Keys:
−
8
´ }