# Complex Numbers

## a + bi, the sum of a real and an imaginary number.

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.

## Complex Numbers

Definition of complex numbers and the complex number system, basic manipulation of complex numbers.
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## Defining Complex Numbers

This lesson covers the powers of i, adding, and subtracting complex numbers.
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## Arithmetic with Complex Numbers

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• PLIX

## Imaginary Rotations

Complex Numbers Interactive
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• Video

## Introduction to i and Imaginary Numbers

Introduces the topic of imaginary numbers.
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• Video

## Complex Numbers

Dives into imaginary numbers deeper and talks about complex number.
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• Video