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Learn about the imaginary unit, "i", a unique number defined as the square root of -1. It's a key part of complex numbers, which are in the form a + bi. The powers of "i" cycle through a set of values.
Complex Numbers - Basic Operations
Intro to Complex Numbers / Imaginary Numbers (Notes, WS, Quiz & Answer Keys)
Complex Fibonacci Numbers Part 1: Real Inputs - Math - Snap! Forums
Introduction to complex numbers
A Visual, Intuitive Guide to Imaginary Numbers – BetterExplained
Introduction to Imaginary Numbers
What Is i? What is i^2? Intro to Imaginary Numbers!
What is the value of the square root of (-1)? - Quora
What is the square of the square root of -12? - Quora
What is the answer to -5 squared? - Quora