document.write( "Question 977698: perimeter of a rectangle is 42 in. the area is 98sq in. what are the dimensions of the rectangle? \n" ); document.write( "
Algebra.Com's Answer #599238 by josgarithmetic(39617)\"\" \"About 
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Better to study and use the lesson. You can still go this way:\r
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\n" ); document.write( "\n" ); document.write( "x and y, the dimensions.
\n" ); document.write( "\"system%282x%2B2y=42%2Cxy=98%29\"\r
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\n" ); document.write( "\n" ); document.write( "\"system%28x%2By=21%2Cxy=98%29\"\r
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\n" ); document.write( "\n" ); document.write( "\"y=21-x\"
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\n" ); document.write( "\"x%2821-x%29=98\"
\n" ); document.write( "\"21x-x%5E2=98\"
\n" ); document.write( "\"-x%5E2%2B21x-98=0\"
\n" ); document.write( "\"highlight_green%28x%5E2-21x%2B98=0%29\"\r
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\n" ); document.write( "\n" ); document.write( "98=2*7*7, probably the quadratic not factorable?\r
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\n" ); document.write( "\n" ); document.write( "Discriminant: \"21%5E2-4%2A98=49=7%5E2\"\r
\n" ); document.write( "\n" ); document.write( "\"x=%2821%2B-+7%29%2F2\"
\n" ); document.write( "\"highlight%28x=7%29\" or \"highlight%28x=14%29\"\r
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\n" ); document.write( "\n" ); document.write( "The rectangle's dimensions will be 7 and 14.
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