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Find the critical numbers by setting the first derivative equal to zero and solving for the x value(s).
The critical value is x=2.
If f'(x)>0 the function is increasing in the interval.
If f'(x)<0 the function is decreasing in the interval.
Choose a value for x that is less than 2.
f'(0)=-32 Since f'(0)<0 the function is decreasing on the interval (-`oo,2).`
Choose a value for x that is greater than 2.
f'(3)=76 Since f'(3)>0 the function is increasing on the interval (2, `oo).`
Since the function changed directions from decreasing to increasing a relative minimum exists. The relative minimum occurs at the point (2, -44).
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