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Thread: Range of a relatively simple function

  1. March 13th 2011, 09:25 PM #1
    theridon
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    Range of a relatively simple function

    f(x)=ln(2-5x)
    I know the domain is x less than 2/5 but what on earth is the range? I don't know if I'm having some sort of mental block or what.
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  2. March 13th 2011, 09:38 PM #2
    mr fantastic
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    Quote Originally Posted by theridon View Post
    f(x)=ln(2-5x)
    I know the domain is x less than 2/5 but what on earth is the range? I don't know if I'm having some sort of mental block or what.
    Draw the graph. The range is R.
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  3. March 13th 2011, 09:42 PM #3
    theridon
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    For some reason when I graph it on my ti83, it goes down only to a certain point-about y=-1.21109
    This is what is throwing me off. Is my calculator at fault?
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  4. March 14th 2011, 06:28 AM #4
    HallsofIvy
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    Probably what is happening is that your calculator doesn't want to show the vertical asymptote at x= 2/5. The graph very rapidly approaches that vertical line.
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  5. March 14th 2011, 06:46 AM #5
    skeeter
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    free graphing program with better resolution than a TI ...

    Graph
    Attached Thumbnails Attached Thumbnails Range of a relatively simple function-log1.jpg  
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