A worker is designing a shelf from a piece of wood that is 10 feet wide. Two pieces of the wood will be cut a
shelf, as shown on the diagram. The cross-sectional area under the shelf will be used as storage space.
cross-sectional
area
Let x be the height of each side. Let A(x) be the cross-sectional area under the shelf. Create a gra
maximum cross-sectional area of the shelf.