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Possible Duplicate:
Square roots — positive and negative

I know that the square roots of four are

  • 2 because $2^2=4$
  • and $-2$ because $(-2)^2=4$

Are there any conventions in considering primarily the positive square root or adding the $\pm$ symbol in the calculator screen would be a cost factor?

  • 0
    There might be even better duplicates, but this one seems adequate.2012-10-01
  • 1
    By definition the symbol $\sqrt{x}$ denotes the non-negative square root of $x$.2012-10-01

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