3 years ago

Look at the function f(x) = x3 - 4 x. which describes an interval in which the function is increasing?

1 answer:

5 0

Differentiate it
get f ' (x)=3x^2-4
put 3x^2-4=0
x=2/√3,-2/√3
so interval
x∈(-2/√3,2/√3)

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