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If a curve with equation of the form `y=ax^(4)+bx^(3)+cx+d` has zero gradient at the point (0, 1) and also touches the x-axis at the point `(-1,0)` then the value of x for which the curve has a negative gradient are

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A curve with equation of the form y=a x^4+b x^3+c x+d has zero gradient at the point (0,1) and also touches the x- axis at the point (-1,0) then the value of x for which the curve has a negative gradient are: xgeq-1 b. x<1 c. x<-1 d. -1lt=xlt=1

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