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Find the derivative of f (x) = - 9/x at x = 6

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  1. 11 May, 02:13
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    F (x) = - 9/x which is equal to:

    f (x) = - 9x^ (-1) So the power rule for differentiation is used ...

    Power rule: f (x) = x^e, df/dx=ex^ (e-1) so:

    df/dx=-9 (-1) x^ (-1-1)

    df/dx=9x^ (-2) or if you prefer ...

    df/dx=9/x^2

    df/dx (6) = 9/36=1/4
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