Originally posted by joshbgosh10592Well chances are that’s because it’s not really useful it’s just a purely hypothetical thing with no applications in real life. This may explain it to a level http://en.wikipedia.org/wiki/Imaginary_unit
o.......k.........? never heard that before
You may also want to look at this
http://www.google.co.uk/search?hl=en&ie=ISO-8859-1&q=the+square+root+of+-1&meta=