SOLUTION: These are square roots, but I can't put the symbol. Evaluate, if possible. -121

Algebra ->  Square-cubic-other-roots -> SOLUTION: These are square roots, but I can't put the symbol. Evaluate, if possible. -121      Log On


   

Question 30168: These are square roots, but I can't put the symbol.
Evaluate, if possible.
-121
Answer by askmemath(368) About Me  (Show Source):
You can put this solution on YOUR website!
Do you know about Imaginary Numbers?
We know that the square of a number is always Positive.
What if there exists such a number whose square is always Negative? Such a number is called Imaginary Number and is denoted by the letter "i"
So i%2Ai+=+i%5E2+=+-1
So -121+=+121i%5E2
sqrt%28121i%5E2%29
121 = 11*11
So your final answer = 11i