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Simple math question about powers

  1. Apr 10, 2012 #1
    Hi,

    This is no doubt a real simple question

    does 21/2 mean 20.5 or 21

    Thanks in advance

    Mike
     
  2. jcsd
  3. Apr 10, 2012 #2

    berkeman

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    Staff: Mentor

    It means 20.5 or √2

    Why would it mean 21 ?
     
  4. Apr 10, 2012 #3
    Sorry, i was 99.99% sure it was 2^0.5 but it was one of those questions you ask when your brain gets wound up from learning a new equation and then you take a step back and its blindingly obvious. Thanks for reply though.
     
  5. Apr 10, 2012 #4

    HallsofIvy

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    Staff Emeritus
    Science Advisor

    1 is NOT the same as 1/2!
     
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