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Math Help - [SOLVED] appropriate simplification when determining a limit of a rational function

  1. #1
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    [SOLVED] appropriate simplification when determining a limit of a rational function

    I am getting a bit lost in the middle of finding the limit of the function below. Two questions.
    A) Is the multiplication of the conjugate correct, and is the denominator properly expanded?
    B) once the expansion is done, I still end up with a value of zero for limit when substituting...
    I know that the answer is , but I am just not seeing how. Can you clarify it for me?
    \lim_{x\to0}\frac{\sqrt{1+h}-1}{h}
    \lim_{x\to0}\frac{\sqrt{1+h}-1}{h}\times\frac{\sqrt{1+h}+1}{\sqrt{1+h}+1}
    \lim_{x\to0}\frac{1+h-1}{h\sqrt{1+h}+h}
    \lim_{x\to0}\frac{h}{h\sqrt{1+h}}
    Last edited by hechz; September 28th 2009 at 11:01 AM.
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  2. #2
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    \lim_{h\to0}\frac{1+h-1}{h\sqrt{1+h}+h} =

    = \lim_{h\to0}\frac{h}{h(\sqrt{1+h}+1)} =


    = \lim_{h\to0}\frac{1}{\sqrt{1+h}+1} = \frac{1}{2}

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  3. #3
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    Thanks!
    Sometimes I don't see the forest for the trees.
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