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sidek
on Dec 3, 2010
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MIT Entrance exam (1869)
Sometimes square root is assumed to refer to the positive one. I assume that was the case here.
gmichnikov
on Dec 3, 2010
[–]
On every notable standardized math test in the US, and on any commonly used calculator, a square root is non-negative. Another example:
http://www.wolframalpha.com/input/?i=sqrt(x)
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