Khan Academy
Introduction to imaginary numbers, including the concept of 'i' and its role in complex numbers.
Imaginary Numbers - Khan Academy Help Center
2017年4月11日 · I have a question--sometimes the answer to the square root of an imaginary number will just be written in positive form with an i, but other times, it will be written like this (ex): 2 √ − 4. When do I know to write an answer in each form (ex). √-38? In other words, when do you know how to write √-38 as 38i or # √ # i?
Intro to complex numbers (video) | Khan Academy
Sal explains how we obtain complex numbers by adding real numbers and imaginary numbers.
Intro to the imaginary numbers (article) | Khan Academy
Learn about the imaginary unit i, about the imaginary numbers, and about square roots of negative numbers.
Intro to complex numbers - Khan Academy
Sal explains how we obtain complex numbers by adding real numbers and imaginary numbers.
Simplifying roots of negative numbers (video) | Khan Academy
Discover the magic of the imaginary unit 'i'! This lesson dives into simplifying the square root of negative numbers using 'i', the principal square root of -1. We'll explore how to rewrite negative numbers as products, and use prime factorization to simplify roots.
Complex numbers | Algebra 2 | Math | خان اکیڈیمی
We'll learn what imaginary and complex numbers are, how to perform arithmetic operations with them, represent them graphically on the complex plane, and apply these concepts to solve quadratic equations in new ways.
Powers of the imaginary unit (video) | خان اکیڈیمی
The imaginary unit i is defined such that i²=-1. So what's i³? i³=i²⋅i=-i. What's i⁴? i⁴=i²⋅i²=(-1)²=1. What's i⁵? i⁵=i⁴⋅i=1⋅i=i. Discover how the powers of 'i' cycle through values, making it possible to calculate high exponents of 'i' easily.
Plotting numbers on the complex plane - Khan Academy
Learn how to plot complex numbers on a unique two-dimensional grid known as the complex plane. Discover the real and imaginary parts of complex numbers, and see how they correspond to the horizontal and vertical axes.
Algebra II - Khan Academy
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