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21. Find the square root: + or -sqrof121

How do you do this?

4 answers

Use a calculator or Google's caluclator.

http://www.google.com/search?source=ig&hl=en&rlz=1G1GGLQ_ENUS374&q=square+root+121
I know square root of 121 is 11. But what does it mean when there's a plus or minus outside the square root?
it means the sqrt of 121 is either +11 or -11

check: (-11)(-11)=121
(+11)(+11)=121
so the answer would be + or - 11?,
or just 11?
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