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Homework Help: Whats reason behind this?

  1. Aug 11, 2009 #1
    The first equation is false whil second is true. What is reason?
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Aug 11, 2009 #2


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    Gold Member

  4. Aug 11, 2009 #3
    The first equation is simply wrong algebra. An easy way to illustrate this would be via a numerical example.
    Consider: 2 + 5 = 7
    Following your first equation, you would obtain 2^2 + 5^2 = 7^2, which is clearly incorrect.
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