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An imaginary number ^[note 1] is a complex numberthat can be written as a real number multiplied by theimaginary unit i, ^[note 2] which is defined by its property i² = −1. The square of an imaginary numberbi is −b². For example, 5i is an imaginary number, and its square is −25.

Imaginary number - Wikipedia, the free encyclopedia

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Imaginary number - Wikipedia, the free encyclopedia

https://en.wikipedia.org/wiki/Imaginary_number

Wikipedia

An imaginary number ^[note 1] is a complex number that can be written as a realnumber multiplied by the imaginary unit i, ^[note 2] which is defined by its property i² = −1. The square of an imaginary number bi is −b². For example, 5i is an imaginary number, and its square is −25.

‎History - ‎Geometric interpretation - ‎Multiplication of square roots - ‎See also

Intro to the imaginary numbers | What are the imaginary ...

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https://www.khanacademy.org/.../im...

Khan Academy

Sal introduces the imaginary unit i, which is defined by the equation i^2=-1. He then gets to know this special ...

Imaginary Numbers - Math is Fun

https://www.mathsisfun.com/numbers/imaginary-numbers.h...

Maths Is Fun

Unit Imaginary Number. The "unit" Imaginary Number (the equivalent of 1 for RealNumbers) is √(−1) (the square root of minus one).

Imaginary Number -- from Wolfram MathWorld

mathworld.wolfram.com › ... › The Da Vinci Code

MathWorld

by EW Weisstein - ‎2002 - ‎Related articles

Although Descartes originally used the term "imaginary number" to refer to what is today known as a complex number, in standard usage today, "imaginary ...

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Images for imaginary numbersReport images

More images for imaginary numbers

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Math Forum: Ask Dr. Math FAQ: Imaginary Numbers

mathforum.org/dr.math/faq/faq.imag.num.html

Math Forum

Contrary to what some people might tell you, imaginary numbers are not numbers that only exist in the brains of weird people. Or maybe they are; all numbers in ...

Complex Numbers: Introduction - Purplemath

www.purplemath.com/modules/complex.htm

Introduces the imaginary number 'i', and demonstrates how to simplify expressions involving the square roots of negative numbers. Warns about a common trick .