-∞<x<0

-∞<x<1

1<x<4

2<x<4

the function f(x)=(x-1)(x-4)2 decreases at the interval -oo<x<0

option A is the correct answer

was the function f(x)=(x-1)(x-4)^2? or f(x)=(x-1)(x-4)2

if it was f(x)=(x-1)(x-4)^2, then the answer is 2<x<4

NOTE; f(x)=(x-1)(x-4)^2 is different from f(x)=(x-1)(x-4)2

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