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

Complex Numbers: The Basics

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

In the 1990s, John Sylvan was drinking 30-40 cups of terrible office coffee a day. He noticed the problem: make a whole pot and it goes stale, or nobody agrees on what type to brew. So he invented the K-Cup—a small plastic pod you pop in a machine for one perfect cup in 30 seconds. He teamed up with his college roommate Peter Dragone and named the company Keurig, Dutch for “excellence.” The plan was simple: offices skip Starbucks, get their coffee at work. It would actually be environmentally ne

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COMPLEX NUMBERS | How to Add, Subtract, Multiply and Divide Complex Numbers

Complex Numbers: Operations, Complex Conjugates, and the Linear Factorization Theorem