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Modulus Function

  1. Feb 13, 2010 #1
    Okay, when I enter into the calculator sqrt(x^2) it equals |x|. Since when? I thought sqrt(x^2) equals x and then when you go to sketch it, it will be a positive diagonal line through the origin whereas |x| is a reflection at the origin.
     
  2. jcsd
  3. Feb 14, 2010 #2
    A number squared is always positive. So if you plug in -10 you get sqrt(100) which is 10.
    When you cancel out the square and the square root in a problem you do that because you're looking for the principle root aka the positive one.
     
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