GRADE 11 · MATHEMATICS · TOPIC 4

Complex Numbers

The imaginary unit i satisfies i² = −1.

CONCEPT EXPLAINED

Understand the concept

The imaginary unit i satisfies i² = −1.

SOLVED EXAMPLE

Simplify i² + 3

  1. Step 1: Substitute −1 for i²
  2. Step 2: −1+3.

Final answer: 2

PRACTISE YOURSELF

Find i⁴

Show the answer

1

Try another similar question and explain each step aloud. Refer to your school syllabus for topic level and notation.