Exactly. Err....well, its an italicized .

[img]http://upload.wikimedia.org/math/0/e/c/0ec6fcb6da4903ce355359d219ef3f5c.png[/img]Therefore,

iequals the square root of -1.:)

That's not true, actually.

If you substitute -3 for x, you get [tex]\sqrt{3} = i\sqrt{-3}[/tex], that is, [tex]\sqrt{3} = -\sqrt{3}[/tex].