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Math Help - Simple rewrite?

  1. #1
    Junior Member
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    Smile Simple rewrite?

    Hey!

    I would be grateful, if anyone can help me with this simple rewrite...

    How does

    (x-y)/(x+y)

    become

    1-2y * (1/(x+y)) ?


    I mean isn't a x missing? Or?

    Thanks a bunch!
    Simon DK
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  2. #2
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    Quote Originally Posted by sh01by View Post
    Hey!

    I would be grateful, if anyone can help me with this simple rewrite...

    How does

    (x-y)/(x+y)
    Note,
    x-y=(x+y)-2y

    Thus,

    (x-y)/(x+y) = ((x+y)-2y)/(x+y) = 1-(2y/(x+y))
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