# Complex numbers

Mathematics II,

Learn about irrational numbers and how to identify them.

This course contains 5 segments:

What are the imaginary numbers?

Learn about the imaginary unit i (which is the square root of -1) and about imaginary numbers like 3i (which is the square root of -9).

What are the complex numbers?

Learn about complex numbers (spoiler: they are numbers that consist of both real and imaginary parts).

The complex plane

Learn how we can visualize complex numbers in a plane. This can be seen as an expansion of the 1-dimensional real number line into a 2-dimensional plane!

Learn how to add or subtract complex numbers. For example, write (2+3i)-(1+2i) as (1+i).

Multiplying complex numbers

Learn how to multiply complex numbers using the fact that i^2=-1 and the distributive property. For example, multiply (1+i) by (2+3i).

Rating Not enough ratings 5 segments On Demand (Start anytime) Free Khan Academy On all desktop and mobile devices English Mathematics Math

## Careers

An overview of related careers and their average salaries in the US. Bars indicate income percentile.

Complex claims processor \$40k

Paralegal - Complex Litigation \$65k

Liaison ~ Complex Sales \$66k

Senior Complex Analyst \$80k

Senior Complex Inspector \$85k

Complex Voice Engineer 2 \$99k

Complex Systems Technical Support Analyst Manager \$101k

Senior Complex Transaction Analyst \$102k

Complex Maintenance Center - Technical Advisor \$103k

Complex Solution Engineer \$132k

Associate Attorney (Labor & Employment and Complex Commercial Litigation) \$269k

## Write a review

Your opinion matters. Tell us what you think.