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Complex numbers

Algebra II,

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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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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