SOLUTION: What is an example of a number that isnt a "real number"?

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Question 11829: What is an example of a number that isnt a "real number"?
Answer by longjonsilver(2297) About Me  (Show Source):
You can put this solution on YOUR website!
sqrt%28-1%29 since no number exists that, when multiplied by itself equals -1.

sqrt%28-1%29 is commonly written as i.

jon.