SOLUTION: Find the square root of -100. I know that the answer is -10. But can't explain it.

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Question 870768: Find the square root of -100. I know that the answer is -10. But can't explain it.
Found 2 solutions by Fombitz, ewatrrr:
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
No, that's not the answer.
sqrt%28-100%29=sqrt%28100%29sqrt%28-1%29
highlight%28sqrt%28-100%29=10%2Ai%29
where i%5E2=-1

Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
sqrt%28-100%29+=+sqrt%28100i%5E2%29 = 10i
Note: i^2 = -1