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calculus

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Determine the value(s) of x where the function will have an instantaneous rate of change of 14. (Enter your answers as a comma-separated list. If an answer does not exist, enter DNE.)
f(x) = x3 + 33 x2 + 14 x + 39

  • calculus -

    f'= 3x^2+66x+14=14

    3x^2+66x=0
    x=0, or x=-22

    check that.

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