How do you find the first and second derivative of the following function?


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  1. P(t) = 20/(1+3e^-0.02t)
    = 20(1+3e^-.02t)^-1

    P'(t) = 20(3e^-0.02t)(-0.02) * (-1)(1+3e^-0.02t)^-2
    = 1.2e^-.02t (1+3e^-.02t)^-2

    P"(t) =
    1.2e^-.02t (-2)(1+3e^-.02t)^-3 (-.06e^-.02t)
    which, after suitable rearranging is
    = 0.024e^-.02t (3e^-.02t - 1)/(1+3e^-.02t)^3

    better check my algebra

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  2. P(t)=20(1+3e^-.02t)^-1

    P'=-20(1+3e^-.02t)^-2 * (-.06e^-.02t)

    P"= 40(1+3e^-.02t)^-3 * (-.06e^-.02t)*(.0012e^-.02t)

    check all that.

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  3. write it as

    P(t) = 20 (1 + 3e^(-.02t)^-1

    P ' (t) = -20(1+3e^-.02t)^-2 (-.02 e^(-.02t) )

    now use the product rule to get the 2nd derivatives
    I suggest cleaning up the first deriv. a bit

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  4. go with Steve's
    I forgot to multiply the .02 by the 3 in front

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