# Changing Sign Of A Complex Number; Entering The Unit Imaginary Number; The Cmplx Menus - HP 50g User Manual

Graphing calculator.

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Thus, the inverse function INV (activated with the Y key) is defined as
x

## Changing sign of a complex number

Changing the sign of a complex number can be accomplished by using the
\ key, e.g., -(5-3i) = -5 + 3i

### Entering the unit imaginary number

To enter the unit imaginary number type : „¥
Notice that the number i is entered as the ordered pair (0,1) if the CAS is set to
APPROX mode. In EXACT mode, the unit imaginary number is entered as i.
Other operations
Operations such as magnitude, argument, real and imaginary parts, and
complex conjugate are available through the CMPLX menus detailed later.

There are two CMPLX (CoMPLeX numbers) menus available in the calculator.
One is available through the MTH menu (introduced in Chapter 3) and one
directly into the keyboard (‚ß). The two CMPLX menus are presented
next.
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