Glossary › Maths and statistics
Complex number
A number with a real part and an imaginary part, written like 3 + 4i.
The imaginary unit i is the square root of −1, so the square root of a negative number is imaginary. Complex numbers appear in electronics, signal processing and physics.
In Ratio
| You type | Ratio shows |
|---|---|
(3 + 4i) * (1 - 2i) | 11 - 2i |
sqrt(-4) | 2i |