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# What is i?

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Hhhhhhhheeeeeeellllllllllllppppppppppp!?!?!!!?!?

Guest May 24, 2017
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What is i?

ummm.... what?

mathguardian23  May 24, 2017
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"i" is the imaginary unit. :)

It has a definition of $$i = \sqrt{-1}$$

Because sqrt(-1) cannot be evaluated(What squared = -1??), so mathematicians imagined a number that satisfies x squared = -1. Therefore "i" is called the imaginary number. :)

MaxWong  May 25, 2017