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Math Help - Square Root

  1. #1
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    Square Root

    When the square root sign is put over an expression, when is it expected to put the +/- results of the evaluation of that expression?

    I have made the following assumptions, please let me know if they are correct:

    if there is no plus or minus in front of a square root then it is implied that only the positive root is wanted
    if there is a negative sign in front of the square root then it is implied that the negative root is wanted


    if there is no plus or minus in front of a square root but the solutions show you a positive and negative answer then
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  2. #2
    MHF Contributor
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    Quote Originally Posted by Noxide View Post
    When the square root sign is put over an expression, when is it expected to put the +/- results of the evaluation of that expression?

    I have made the following assumptions, please let me know if they are correct:

    if there is no plus or minus in front of a square root then it is implied that only the positive root is wanted
    if there is a negative sign in front of the square root then it is implied that the negative root is wanted


    if there is no plus or minus in front of a square root but the solutions show you a positive and negative answer then

    HI

    when you have x=\sqrt{4} , then x=2

    But if you have x^2=4\Rightarrow x=\pm\sqrt{4}
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