document.write( "Question 669064: One formula stating the relationship between length l and width w of a rectangle of \"pleasing proportion\" is \"+l%5E2=w%28l%2Bw%29+\". How should a 4 foot by 8 foot sheet of plasterboard be cut so that the result is a rectangle of “pleasing proportion” with a width of 4 feet?\r
\n" ); document.write( "\n" ); document.write( "I really don't even know where to start. Thanks! :-)
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Algebra.Com's Answer #416051 by josmiceli(19441)\"\" \"About 
You can put this solution on YOUR website!
What they are saying is that you need to end
\n" ); document.write( "up with a piece of plasterboard that is
\n" ); document.write( "4 feet by \"+l+\" feet, and you need the formula
\n" ); document.write( "\"+l%5E2+=+w%2A%28+l+%2B+w+%29+\" to find \"+l+\"
\n" ); document.write( "------------
\n" ); document.write( "\"++w+=+4+\"
\n" ); document.write( "\"+l%5E2+=+4%2A%28+l+%2B+4+%29+\"
\n" ); document.write( "\"+l%5E2+=+4l+%2B+16+\"
\n" ); document.write( "\"+l%5E2+-+4l+=+16+\"
\n" ); document.write( "Complete the square
\n" ); document.write( "\"+l%5E2+-+4l+%2B+%28+%28-4%29%2F2+%29%5E2+=+%28+%28-4%29%2F2+%29%5E2+%2B+16+\"
\n" ); document.write( "\"+l%5E2+-+4l+%2B+4+=+4+%2B+16+\"
\n" ); document.write( "\"+%28+l+-+2+%29%5E2+=+%28+sqrt%2820%29+%29%5E2+\"
\n" ); document.write( "\"+i+-+2+=+sqrt%2820%29+\"
\n" ); document.write( "\"+l+=+2+%2B+2%2Asqrt%285%29+\"
\n" ); document.write( "\"+l+=+2+%2B+4.472+\"
\n" ); document.write( "\"+l+=+6.472+\"
\n" ); document.write( "The dimensions are 4' x 6.472'
\n" ); document.write( "check:
\n" ); document.write( "\"+l%5E2+=+4%2A%28+l+%2B+4+%29+\"
\n" ); document.write( "\"+41.887+=+4%2A10.472+\"
\n" ); document.write( "\"+41.887+=+41.888+\"
\n" ); document.write( "Looks close enough\r
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