document.write( "Question 1198345: a rectangular piece of artwork is 4 meters wide and 6 meters long it is surround by a uniform sidewalk if the area of the sidewalk is 39 square meters how wide is the sidewalk?\r
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Algebra.Com's Answer #831917 by ikleyn(52786)\"\" \"About 
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\n" ); document.write( "a rectangular piece of artwork is 4 meters wide and 6 meters long
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document.write( "Let x be the unknown width of the sidewalk.\r\n" );
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document.write( "Write the area equation for the sidewalk as the difference of the areas of the larger and smaller rectangles\r\n" );
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document.write( "    (4+2x)*(6+2x) - 4*6 = 39  square meters.\r\n" );
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document.write( "To find x, simplify it step by step\r\n" );
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document.write( "    24 + 12x + 8x + 4x^2 - 24 = 39\r\n" );
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document.write( "    4x^2 + 20x - 39 = 0\r\n" );
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document.write( "Use the quadratic formula and accept a positive root, ONLY.\r\n" );
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document.write( "ANSWER.  The wide of the sidewalk is 1.5 m.\r\n" );
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document.write( "CHECK.   (4+2*1.5)*(6+2*1.5) = 7*9 = 63;  63 - 24 = 39  square meters.  ! correct !\r\n" );
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