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Thread: Function trouble!

  1. #1
    Sep 2008

    Function trouble!

    Hey guys!

    We've spent the last 5 classes using derivatives to study to graphically represent functions, but there are some functions which seem to give you a headache.

    for example : f(x)=\frac{(4-x)^3}{9(2-x)}

    i found where the function is defined ( (-\infty , 2)u (2 , +\infty)),
    i found the asimptotes ( it has only a vertical one at x=2) , but when I have to find monotony and extreme values I get stuck.
    First I find the first derivative, then I have to make it equal to zero and then I'm left with  -3x^3+35x^2-135x+176=0. how do I find x from here?

    It sounds silly, but i'm kinda stuck.

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  2. #2
    Sep 2008
    no worries, I got it right!
    thnx anyhow
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