help out pls

Let f(x)=8x^2−2x^4. Find the open intervals on which f is increasing (decreasing). Then determine the x-coordinates of all relative maxima (minima).

 

 

1.  
f is increasing on the intervals
2.  
f is decreasing on the intervals
3.  
The relative maxima of f occur at x =
4.  
The relative minima of f occur at x =

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