1. Section 4.8.1 – Complex Numbers
Objective: Identify, graph and use complex numbers
EQ: What are imaginary numbers, and how do I use them?

2. Essential Understandings
Imaginary Unit
If then
Complex Numbers
Number in the form of
a – is the real part
b – is the imaginary part

3. Essential Understandings
Complex Number Plane
x-axis is the real axis
y-axis is the imaginary axis
Points are (a, b)
Absolute Value of a complex number
Distance from the origin in the complex plane.

4. Ex. 1 – Simplify

5. Ex. 2 – What are the graph and absolute value of

6. Ex. 3 – Adding and subtracting complex numbers

7. Ex. 4 – Multiplying complex numbers (remember, )