If a curve with equation of the form y=a...

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

`x gt -1`

`x lt 1`

`x lt -1`

`-1 le x le 1`

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