document.write( "Question 929542: What is the length and width of a rectangle with a perimeter of 40 feet and an area of 84 square feet?
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Algebra.Com's Answer #564663 by Fombitz(32388) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"A=L%2AW=84\"$
\n" ); document.write( " $\"P=2%28L%2BW%29=40\"$
\n" ); document.write( " $\"L%2BW=20\"$
\n" ); document.write( "Substituting,
\n" ); document.write( " $\"L=84%2FW\"$
\n" ); document.write( "into the perimeter equation,
\n" ); document.write( " $\"84%2FW%2BW=20\"$
\n" ); document.write( " $\"84%2BW%5E2=20W\"$
\n" ); document.write( " $\"W%5E2-20W%2B84=0\"$
\n" ); document.write( " $\"%28W-14%29%28W-6%29=0\"$
\n" ); document.write( "Two solutions:
\n" ); document.write( " $\"W-14=0\"$
\n" ); document.write( " $\"W=14\"$
\n" ); document.write( "Then,
\n" ); document.write( " $\"L=84%2F14\"$
\n" ); document.write( " $\"L=6\"$
\n" ); document.write( "and
\n" ); document.write( " $\"W-6=0\"$
\n" ); document.write( " $\"W=6\"$
\n" ); document.write( "and
\n" ); document.write( " $\"L=84%2F6\"$
\n" ); document.write( " $\"L=14\"$
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