HP 15c Scientific Entering a Real Number

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.)