411 REFERENCE · Wikibooks
Arithmetic Course/Types of Number/Imaginary Number
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
Imaginary Number
Imaginary Number is defined as
Mathematic Operations
Addition
i + 0 = i
i + i = 2i
i + (-i) = 0
Subtraction
i - 0 = i
i - i = 0
i - (-i) = 2i
Multiplication
i x 0 = 0
i x i = i2 = -1
i x (-i) = -i2 = 1
Division
i / 0 = Error
i / i = 1
i / (-i) = -1