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Math Help - first principles

  1. #1
    Junior Member
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    Nov 2007
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    first principles

    Hey i need help with this question:

    Find the derivative of the function f(x)=1/(x+2) by using first principles.


    We have to use first principles, please and thanks you.
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  2. #2
    Math Engineering Student
    Krizalid's Avatar
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    Santiago, Chile
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    If the limit exists, then

    f'(x) = \mathop {\lim }\limits_{\Delta x \to 0} \frac{{f\left( {x + \Delta x} \right) - f(x)}}<br />
{{\Delta x}}.

    And f\left( {x + \Delta x} \right) = \frac{1}<br />
{{\left( {x + \Delta x + 2} \right)}}. You may perform from there the calculations.
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