# given the function f(x)=x^3-4x ,what are approximately the intervals on which f is increasing?

### 1 Answer

Relevance

- billrussell42Lv 73 weeks agoFavourite answer
points where slope is zero are:

y = x³ - 4x

y = 3x² – 4 = 0

x² = 4/3

x = ±1.155

increasing from –∞ to –1.155

and from +1.155 to +∞

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