Complex numbers
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Learn about complex numbers and how to add, subtract, and multiply them. This will come in useful when working with polynomials.
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!
Adding and subtracting complex numbers
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).
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| Rating | Not enough ratings |
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| Length | 5 segments |
| Starts | On Demand (Start anytime) |
| Cost | Free |
| From | Khan Academy |
| Download Videos | On all desktop and mobile devices |
| Language | English |
| Subjects | Mathematics |
| Tags | Math Algebra II |
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| Rating | Not enough ratings |
|---|---|
| Length | 5 segments |
| Starts | On Demand (Start anytime) |
| Cost | Free |
| From | Khan Academy |
| Download Videos | On all desktop and mobile devices |
| Language | English |
| Subjects | Mathematics |
| Tags | Math Algebra II |
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