Imaginary Numbers - mathsisfun.com
https://www.mathsisfun.com/numbers/imaginary-numbers.htmlImaginary Numbers are not "Imaginary". Imaginary Numbers were once thought to be impossible, and so they were called "Imaginary" (to make fun of them).. But then people researched them more and discovered they were actually useful and important because they filled a gap in mathematics ... but the "imaginary" name has stuck.. And that is also how the name "Real …
Imaginary number - Wikipedia
https://en.wikipedia.org/wiki/Imaginary_numberAn imaginary number is a complex number that can be written as a real number multiplied by the imaginary unit i, which is defined by its property i = −1. The square of an imaginary number bi is −b . For example, 5i is an imaginary number, and its square is −25. By definition, zero is considered to be both real and imaginary. Originally coined in the 17th century by René Descartesas a derogatory term and regarded as fict…