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#
Precalculus

#### Course content

#### Complex numbers

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#### Polynomials

#### Composite functions

#### Trigonometry

#### Vectors

#### Matrices

#### Series

#### Conic sections

#### Probability and combinatorics

Free

298 Lessons

Intro to the imaginary numbers

Powers of the imaginary unit

Simplifying roots of negative numbers

i as the principal root of -1

What are the imaginary numbers?

What are the complex numbers?

Intro to complex numbers

Classifying complex numbers

The complex plane

Plotting numbers on the complex plane

Adding and subtracting complex numbers

Adding complex numbers

Subtracting complex numbers

Distance and midpoint of complex numbers

Distance & midpoint of complex numbers

Multiplying complex numbers

Multiplying complex numbers

Complex conjugates and dividing complex numbers

Intro to complex number conjugates

Complex number conjugates

Dividing complex numbers

Identities with complex numbers

Complex numbers & sum of squares factorization

Factoring sum of squares

Absolute value and angle of complex numbers

Absolute value of complex numbers

Absolute value & angle of complex numbers

Polar form of complex numbers

Polar & rectangular forms of complex numbers

Multiplying and dividing complex numbers in polar form

Dividing complex numbers: polar & exponential form

Powers of complex numbers

Complex number equations: x³=1