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    Hi im completly disparing over inverse functions, if anyone can help i will love you forever!!

    Ok ok so here some examples of the type of inverse i cant do. Find the inverse or f-1 (x):

    f(x) = (2x+1) divided by (x+2)

    or f(x) = (2x+1) divided by (a-x)



    please help thanku!
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    rewrite them as  y = \frac{2x+1}{x+2}

    then make x the subject so for this example:

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

=> xy + 2y = 2x +1

    bring everything to one side and factorise:

    xy + 2y - 2x - 1 = 0

=> x(y-2) + 2y - 1 =0

    can you go from there?
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    Yep thanku! Problem sorted =D
 
 
 
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Updated: July 11, 2009

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