SOLUTION: Evaluate, if possible. √-121 THis is my radical symbol √

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Question 78128: Evaluate, if possible. √-121
THis is my radical symbol √
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
Since we have a negative number in the radicand (we can't take a square root of a negative number) we have to factor out a negative 1
sqrt%28-1%2A121%29

sqrt%28-1%29%2Asqrt%28121%29 Break up the square roots

Since i=sqrt%28-1%29 and 121 is a perfect square we get:

11i

So in other words sqrt%28-121%29=11i