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Query · Answer 1 · 2015-07-11T23:32:14+0000

The symbol √ means "square root of". √16 means "square root of 16".
It's a number that gives 16 when you multiply the number by itself.

There are two numbers that can both do the job. They are +4 and -4.

(+4) times (+4) = 16

(-4) times (-4) = 16

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