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Cancelling the signs

  1. Jan 22, 2014 #1

    adjacent

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    1. The problem statement, all variables and given/known data
    This is the simplest problem you would ever get.
    ##\frac{-fu}{s-f}=\frac{fu}{-s+f}##
    This is true.
    So the signs can be cancelled.What are the rules for doing that?
    I guess I was not listening to the teacher when I first learned algebra.


    3. The attempt at a solution
    Don't think that I don't know algebra.I just want to know the rules of THAT.
     
  2. jcsd
  3. Jan 22, 2014 #2
    Multiplying numerator and denominator of a rational number by a non zero number keeps it unchanged .The non zero number in this case is -1.
     
  4. Jan 22, 2014 #3

    adjacent

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    Ok.Thanks,
    I never thought I would not know something thing like that. :)
     
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