document.write( "Question 949912: the perimeter of a rectangle is 36 cm & its area is 80sq. cm final its length & breath? \n" ); document.write( "
Algebra.Com's Answer #579975 by lwsshak3(11628)\"\" \"About 
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the perimeter of a rectangle is 36 cm & its area is 80sq. cm final its length & breath?
\n" ); document.write( "***
\n" ); document.write( "let x=width (shorter dimension)
\n" ); document.write( "let y=length
\n" ); document.write( "set up 2 equations, one for perimeter and the other for area
\n" ); document.write( "2x+2y=perimeter=36
\n" ); document.write( "x*y=area=80
\n" ); document.write( "y=80/x
\n" ); document.write( "2x+2y=36
\n" ); document.write( "2x+2*80/x=36
\n" ); document.write( "2x+160/x=36
\n" ); document.write( "2x^2+160=36x
\n" ); document.write( "x^2-18x+80=0
\n" ); document.write( "(x-10)(x-8)=0
\n" ); document.write( "x=8
\n" ); document.write( "y=80/x=10
\n" ); document.write( "width=8 cm
\n" ); document.write( "length=10 cm \n" ); document.write( "
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