Answer :

f(x)=2x3+9x2+12x+15


f’(x)=6x2+18x+12


f’(x)=6(x2+3x+2)


=6(x+2)(x+1)



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


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