A square piece of cardbroad measuring x ...

A square piece of cardbroad measuring x inches by x inches is to be used to form an open box by cutting off 2-inch squares, and then folding the slides up along the dotted lines, as shown in the figure above.
If x is an integer , and the volume of the box must be greater than 128 cubic inches , what is the smallest value of x that can be used ?

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