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Math Help - derivate

  1. #1
    Junior Member
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    derivate

    If , find .

    f(x) = 4x + 2x^-1

    f ' (x) = 4 - 2x^-2 = 4 - 2/x^2

    can anybody tell me what im doing wrong?
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  2. #2
    Junior Member
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    Feb 2010
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    y=4x+\frac{2}{x}

    then

    y' = 4+2\cdot \left(\frac{1}{x} \right)'

    Now using the quotient rule

    y'=4-2 \cdot \left(\frac{1}{x^2} \right)

    can now conclude
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  3. #3
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    thank you my good sir
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