HP 15c Scientific manual Entering a Real Number, Followed by another number

128 Section 11: Calculating With Complex Numbers

T

Z

Y

X Keys:

Re	Im
a	b
c	d

ef

7 8

Re	Im
a	b
c	d
e	f
0	8

−

Re	Im	Re	Im
a	b	a	b
c	d	c	d
e	f	e	f
9	8	17	144

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.)

T

Z

Y

X Keys:

Re	Im
a	b

cd

e f

17 144

4

Re	Im	Re	Im
c	d	e	f
e	f	17	144
17	144	4	0
4	0	4	0

v(Followed by another number.)