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Finding the function that represents the volume of the box.

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If I have an open-top box that is to be constructed from a 6 by 8 foot rectangular cardboard by cutting out equal squares at each corner and the folding up the flaps. Let x denote the length of each side of the square to be cut out.

How do I find the function V that represents the volume of the box in terms of x?
How do you graph this?

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