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Not clear on what happened (subtraction of two fractions with variables to exponents)

  1. Sep 4, 2012 #1
    -2((1/((x^2 + 1)^2 )) - ((4x^2 )/(x^2 +1)^3 )) = 6x^2-2/(x^2+1)


    This is actually the last step of this problem. I understand everything they did up until here, but I'm a bit confused as to how they got from their last step, to the actual answer. Could someone explain?
     
  2. jcsd
  3. Sep 4, 2012 #2

    CAF123

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    Re: Not clear on what happened (subtraction of two fractions with variables to expone

    Are you missing a '-' in front of the coefficient of the [itex] x^2 [/itex] term and should that be [itex] (x^2+1)^3 ? [/itex]
     
  4. Sep 4, 2012 #3

    Ray Vickson

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    Re: Not clear on what happened (subtraction of two fractions with variables to expone

    Don't you mean (6x^2 - 2)/(x^2 + 1)? You wrote 6x^2 - 2/(x^2+1), which is a completely different thing.

    RGV
     
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