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March 25, 2017

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find the interval(s) where the following functions are increasing and decreasing.
f(x)= x/4 + 4/x

  • calculus - ,

    f ' (x) = 1/4 - 4/x^2
    = 0 for a turning point (max/min)

    1/4 = 4/x^2
    x^2 = 16
    x = ± 4

    make a rough sketch to see that

    the curve is increasing for x<-4 OR x>4
    the curve is decreasing for -4 < x< 4 , x±0

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