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

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

User Zhe
by
7.7k points

1 Answer

4 votes
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)
User Furkan Gulsen
by
8.9k points
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