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\[ b^{2}-4ac < 0 ===>\]
there are 32 imaginary roots

\[\sqrt{-25}=5i\]

I know that figure but how is it defined?

\[(5i)^2=-25\]

I mean the "i"

^ tsk tsk

when b^2-4ac is negative or less than 0

http://en.wikipedia.org/wiki/Imaginary_number

Sorry I was replying to Prashant. Thanks Zarkon!

Of course. It's IMAGINARY. lol