Calculator Activity

COMPLEX NUMBERS

OBJECTIVE: To calculate the modulus, the complex conjugate, and to simplify complex expressions.

The absolute value or modulus of a complex numbers is defined as x iy x 2 y 2 .

Before starting put your calculator in CPLX mode by pressing .

1. What is the modulus of 2 i ?

STEP 1: To start the absolute value press .

STEP 2: To enter 2 press .

STEP 3: To enter i press and then press .

STEP 4: To determine the modulus press .

2. What is the complex conjugate of 1 2i ?

STEP 1: Press .

STEP 2: To enter 1 2i press .

STEP3: Press to get the complex conjugate.

3. Simplify 1 2i3 6 i

STEP 1: To enter 1 2i3 press .

STEP 2: To subtract press .

STEP 3: To enter 6 i press .

STEP 4: To solve press .

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