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find the intervals on which the function is increasing or decreasing and find any relative minima or maxima.

f(x)=0.2x^3-0.2x^2-5x-4

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f=1/5 (x+4)(x^2 - 5x - 5)
f' = .6x^2 - .4x - 5
f'=0 at x = 1/3 (1 ± 2√19)

f increases where f' > 0

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