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How to find x?

  1. Feb 10, 2008 #1
    1. The problem statement, all variables and given/known data
    [tex]\frac{2-x}{2+x}=t^3[/tex]
    How to find x?




    Answer is
    [tex]x=\frac{2-2t^3}{1+t^3}[/tex]
     
  2. jcsd
  3. Feb 10, 2008 #2

    quasar987

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    Start by multiplying both sides of the equation by (x+2).
     
  4. Feb 10, 2008 #3

    CompuChip

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    Reminds me of this very old one :biggrin:

    (but seriously, do what quasar987 told you)
     
  5. Feb 10, 2008 #4
    I don't understand where this leading. It still will be
    [tex]2-x=2t^3+xt^3[/tex] so what?
     
  6. Feb 10, 2008 #5

    quasar987

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    Then send everything on the same side of the equation so that you get

    [tex]2-x-2t^3+xt^3=0[/tex]

    and factor the x.
     
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