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Math Help - Function fraction q

  1. #1
    Junior Member
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    Function fraction q

    If f(x) = 2x+1,
    write as a single fraction f (x+1)/ f (x-1) - f(x-1)/ f (x+1).

    Can someone help me with this please. I have the solution where the f (x + 1)
    turns to 2(x+1) +1 but I dont get how you get to that.
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  2. #2
    Super Member bigwave's Avatar
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    Quote Originally Posted by Detanon View Post
    If f(x) = 2x+1,
    write as a single fraction f (x+1)/ f (x-1) - f(x-1)/ f (x+1).

    Can someone help me with this please. I have the solution where the f (x + 1)
    turns to 2(x+1) +1 but I dont get how you get to that.
    IF f(x) = 2x+1

     <br />
\frac{f (x+1)}{f (x-1)} - \frac{f(x-1)}{f (x+1)}<br />

    plug in what is inside the f(...) into 2x+1 where the x is

    like this

    \frac{2(x+1)+1}{2(x-1)+1}- \frac{2(x-1) +1}{2(x+1) +1}

    the rest is just algebra of combining 2 fractions
    Last edited by bigwave; December 12th 2009 at 11:26 AM. Reason: more info
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