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6 May, 10:14

A box without a top is to be made from a 30 cm by 30 cm rectangular piece of cardboard by cutting out square corners with a side length of x and then folding up and taping the sides.

What is the maximum possible volume of the box?

What value of x maximizes the volume of the box?

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  1. 6 May, 13:09
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    The dimensions of the box will be (30 - 2x) cm square by x cm deep. The volume is the product of the length, width, and depth.

    V = x (30 - 2x) ²

    A graphing calculator can show the local maximum of this function.

    a) The maximum possible volume is 2000 cm³.

    b) The value of x that maximizes the volume of the box is 5 cm.
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