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I think it is Xi (whatever the square root of the positive is times i).

i is an imaginary number that when you square it, it becomes negative.

eg. the square root of -4 is 2i. Without "i", it would be impossible to square root a negative number, as any number times itself will always equal a positive.

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14y ago

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Q: What is a number that is a square root of a negative number?
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