document.write( "Question 34566: You have a rectangle. Find the value of x if L = X + 3 and W = X
\n" ); document.write( "Area = 28 \n" ); document.write( "
Algebra.Com's Answer #20867 by MrTillman(3)\"\" \"About 
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Set up your equation first. Area = L W
\n" ); document.write( " 28 = (x+3)(x) (since you said L=x+3, and w=x)\r
\n" ); document.write( "\n" ); document.write( "Now you have 28 = \"x%5E2+%2B+3x\"\r
\n" ); document.write( "\n" ); document.write( "This means you have a quadratic to solve, so set it equal to zero, by putting all terms on one side to get\r
\n" ); document.write( "\n" ); document.write( "\"x%5E2+%2B+3x+-28+=+0\"\r
\n" ); document.write( "\n" ); document.write( "Factor this to get (x+7)(x-4) = 0\r
\n" ); document.write( "\n" ); document.write( "Now set both to zero to solve for x x + 7 = 0 x=-7
\n" ); document.write( " x - 4 = 0 x=4\r
\n" ); document.write( "\n" ); document.write( "Since you can't have a negative value for length, the answer for x can only be 4\r
\n" ); document.write( "\n" ); document.write( "Therefore your width is 4 and Length = 4 + 3 or 7 \r
\n" ); document.write( "\n" ); document.write( "x=4 \n" ); document.write( "
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