document.write( "Question 399060: A rectangular prism has a surface area of 256 sq in. What is the maximum volume it can hold? \n" ); document.write( "
Algebra.Com's Answer #282692 by richard1234(7193)\"\" \"About 
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Suppose the dimensions of the prism are L, W, H. Then,\r
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\n" ); document.write( "\n" ); document.write( "\"2%28LW+%2B+WH+%2B+LH%29+=+256\" --> \"LW+%2B+WH+%2B+LH+=+128\"\r
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\n" ); document.write( "\n" ); document.write( "By the AM-GM inequality (arithmetic mean - geometric mean inequality),\r
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\n" ); document.write( "\n" ); document.write( "\"%28LW+%2B+WH+%2B+LH%29%2F3+%3E=+root%283%2C+L%5E2W%5E2H%5E2%29\"\r
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\n" ); document.write( "\n" ); document.write( "\"128%2F3+%3E=+root%283%2C+L%5E2W%5E2H%5E2%29\" Cubing both sides,\r
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\n" ); document.write( "\n" ); document.write( "\"128%5E3%2F3%5E3+%3E=+L%5E2W%5E2H%5E2\"\r
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\n" ); document.write( "\n" ); document.write( "\"sqrt%28128%5E3%2F3%5E3%29+%3E=+LWH\", this value is the maximum volume of the prism, which occurs when the solid is a cube.
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