Answer :


f’(x)=(12x3-24x2-60x+72)/10


=1.2(x3-2x2-5x+6)


=1.2(x-1)(x-3)(x+2)



Function f(x) is decreasing for x (-∞,-2] [1, 3] and increasing in x (-2,1) (3, ∞)


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