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Math Help - Derivative

  1. #1
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    Derivative

    (x) = 1/x+2
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  2. #2
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    Re: Derivative

    1. Why have you put a question about a Derivative in Pre-Calculus when it is clearly Calculus?

    2. Some brackets where they're needed to avoid ambiguity would be nice. Is your function \displaystyle \begin{align*} f(x) = \frac{1}{x} + 2 \end{align*} or \displaystyle \begin{align*} f(x) = \frac{1}{x + 2} \end{align*}?

    3. Have you tried anything? Please post what you have tried and exactly where you are stuck.
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  3. #3
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    Re: Derivative

    use \[\mathop {\lim }\limits_{h \to 0} (f(x + h) - f(x))/h\] and find the answer
    by the way we write f(x+h) by replacing x by x+h everywhere in the function....
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  4. #4
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    Re: Derivative

    brosnan123, because you have shown no attempt yourself, we have no idea what methods you can, or are allowed, to use. mpx86 indicated a method using the basic definition. But there are also many "rules", such as the "power rule" (the derivative of x^n is nx^(n-1)) that could be applied here.
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