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TriciaWagner
The square root of a negative number is undefined because there is no real number which, when squared, is negative.
Hatrmonstr
A negative number is not a real number which, squared, is negative. 
You can't get square a number and get a negative. If you square a negative number, it'll become positive, therefore you can't square root a negative number because it doesn't exist. 
Hope this helps!

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