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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.

Enter imaginary part first.

´ }

7.0000

Displays real part; Complex

mode activated.

−

0.0000

Disables stack. (Otherwise, it

would lift following }.)

Enters real part (digit entry not

terminated).

| x

17.0000

Real part.

´ % (hold)

(release)

144.0000

Imaginary part.

17.0000

Keys:

−

´ }

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HP 15C Bedienungsanleitung Seite 127