Question 370483
A rectangular piece of cardboard is 13 inches long and 9 inches wide. From each corner a square piece is cut out, and then the flaps are turned up to form an open box. Determine the length of a side of the square pieces so that the volume of the box is as large as possible. 

i got this:
V=(13-2h)(9-2h)(h)
but what do i do next?
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Find the derivative:
dV/dh = ?
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Then solve dV/dh = 0
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Use the 2nd derivative test to determine at what "h" you have a maximum.
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Cheers,
Stan H.
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