A box with square base and open top is to be constructed from a square sheet of cardboard by
cutting out a square from each of the four corners and bending up the sides. The cardboard piece
has an area of 81 cm2. What is the largest possible volume of the box?

Question

A box with square base and open top is to be constructed from a square sheet of cardboard by
cutting out a square from each of the four corners and bending up the sides. The cardboard piece
has an area of 81 cm2. What is the largest possible volume of the box?

anonymous · Answer

have the answer but can not get

anonymous · Answer

Refer to the attachment.