SOLUTION: What square root property is essential to sove any radical equation involving square root?

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Question 4813: What square root property is essential to sove any radical equation involving square root?
Answer by ichudov(507) About Me  (Show Source):
You can put this solution on YOUR website!
One that comes to mind is that, as long as we deal with real numbers (before we study imaginary numbers), square root only makes sense if it is taken from a non-negative number.