From a 18-cm by 18-cm piece of cardboard, square corners are cut out so that the sides can be folded up to make a box. Complete parts a through c below. a) Express the volume of the box as a function of the side x, in centimeters, of a cut-out square. V= 324x+ 4x - 72x? b) Find the domain of the function. (Type your answer in interval notation.)

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