Introduction to complex numbers | Imaginary and complex numbers | Precalculus | Khan Academy

What are complex numbers? | Essence of complex analysis #2

Complex numbers - basic introduction

Roots of Complex Numbers

Finding the nth Roots of a Complex Number

07b - Roots of Complex Numbers using De Moivre's Theorem | De Moivre's Theorem Problems

Complex Roots of Polynomials

Polynomials with Complex Roots

Example: Complex roots for a quadratic | Algebra II | Khan Academy