Question: What are the intervals of decrease for the function a(x) when a'(x)=x^4-x^3-x^2+x a)-0.641 b) None of these c) x 0(I know this answer is not

What are the intervals of decrease for the function a(x) when a'(x)=x^4-x^3-x^2+x a)-0.641 b) None of these c) x<-1, x>0(I know this answer is not right) d) x<-1,01 e)-1

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