document.write( "Question 183801:  The length of a picture is 1 inch less than twice its width.  The frame around the picture has a uniform width of 2 inches and an area of 96 square inches.  What are the dimensions of the picture?\r
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document.write( "Here's what I tried.\r
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document.write( "L =  2w-1
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document.write( "W = 2
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document.write( "A = LXW = 96\r
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document.write( "L = 2(2) -1
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document.write( "L = 4-1
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document.write( "L = 3 \r
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document.write( "doesn't make sense though\r
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document.write( "Thanks for the help!
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| Algebra.Com's Answer #137921 by stanbon(75887)      You can put this solution on YOUR website! The length of a picture is 1 inch less than twice its width. The frame around the picture has a uniform width of 2 inches and an area of 96 square inches. What are the dimensions of the picture? \n" ); document.write( "------------------------ \n" ); document.write( "Draw the picture of a rectangle inside a rectangle. \n" ); document.write( "------------------------- \n" ); document.write( "Label the length and the width of the inner rectangle. \n" ); document.write( "Let width = w \n" ); document.write( "Then length= 2w - 1 \n" ); document.write( "Area of the inner rectangle = w(2w-1) = 2w^2-w sq. in. \n" ); document.write( "--- \n" ); document.write( "Label the length and width of the outer rectangle. \n" ); document.write( "Width is w + 4 inches \n" ); document.write( "Length is 2w-1+4 = 2w +3 inches \n" ); document.write( "Area of the outer rectangle = (w+4)(2w+3) = 2w^2+7w+12 sq. in.\r \n" ); document.write( "\n" ); document.write( "--------------------------------------------- \n" ); document.write( "Area of the picture = outer rectangle area - inner rectangle area \n" ); document.write( "96 = 2w^2+7w+12 -(2w^2-w) \n" ); document.write( "8w + 12 = 96 \n" ); document.write( "2w + 3 = 24 \n" ); document.write( "2w = 21 \n" ); document.write( "w = 21/2 inches (width of the picture) \n" ); document.write( "L = 2w-1 = 21-1 = 20 (length of picture)\r \n" ); document.write( "\n" ); document.write( "===================================== \n" ); document.write( "Cheers, \n" ); document.write( "Stan H. \n" ); document.write( "--- \n" ); document.write( " \n" ); document.write( " |