Answer :

f(x)=x4-4x3+4x2+15


f’(x)=4x3-12x2+8x


= 4x(x2-3x+2)


=4x(x-1)(x-2)



Function f(x) is decreasing for x (-∞,0] [1, 2] and increasing in x (0,1) (2, ∞)


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