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## What are complex numbers?

Examples of a complex number
• $$3 + 5 i$$
• $$12 + \sqrt{-3}$$ ($$\sqrt{-3}$$ is the imaginary part)
• $$4 +22i$$
• $$11 - i$$
• $$12 - \sqrt{-125}$$ ($$\sqrt{-125}$$ is the imaginary part)

## How do you graph complex numbers?

Practice Problems

Problem 1 Identify the coordinates of all complex numbers represented in the graph below.

 Show Coordinates

Problem 2) In what quadrant, is the complex number $$2- i$$ ?
Problem 3) In what quadrant, is the complex number $$2i -1$$ ?
Problem 4) In what quadrant, is the complex number $$-i -1$$ ?