document.write( "Question 68989: the length of a rectangle is 4m more than the width.The area is 30m squared. Find the width and length. \n" ); document.write( "
Algebra.Com's Answer #49105 by Edwin McCravy(20056)\"\" \"About 
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the length of a rectangle is 4m more than the width.\r\n" );
document.write( "The area is 30m squared. Find the width and length.\r\n" );
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document.write( "Let the width be x\r\n" );
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document.write( ">>...the length...is 4m more than the width...<<\r\n" );
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document.write( "So the width = x + 4\r\n" );
document.write( " ___________\r\n" );
document.write( "|   x + 4   |\r\n" );
document.write( "|          x| \r\n" );
document.write( "|___________|\r\n" );
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document.write( "           A = (length)(width)\r\n" );
document.write( "          30 = (x + 4)(x)\r\n" );
document.write( "    x(x + 4) = 30\r\n" );
document.write( "     xｲ + 4x = 30\r\n" );
document.write( "xｲ + 4x - 30 = 0\r\n" );
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document.write( "That doesn't factor, so we use the quadratic formula:\r\n" );
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document.write( "            xｲ - 6x + 4 = 0\r\n" );
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document.write( "Use the quadratic formula:\r\n" );
document.write( "                  ______ \r\n" );
document.write( "            -b ｱ ﾖbｲ-4ac\r\n" );
document.write( "        x = 覧覧覧覧覧覧予r\n" );
document.write( "                2a \r\n" );
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document.write( "where a = 1; b = 4; c = -30\r\n" );
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document.write( "                     ______________ \r\n" );
document.write( "             -(4) ｱ ﾖ(4)ｲ-4(1)(-30)\r\n" );
document.write( "        x = 覧覧覧覧覧覧覧覧覧覧覧覧\r\n" );
document.write( "                     2(1) \r\n" );
document.write( "                   ______ \r\n" );
document.write( "             -4 ｱ ﾖ16+120\r\n" );
document.write( "        x = 覧覧覧覧覧覧覧\r\n" );
document.write( "                  2\r\n" );
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document.write( "                   ___ \r\n" );
document.write( "             -4 ｱ ﾖ136\r\n" );
document.write( "        x = 覧覧覧覧覧予r\n" );
document.write( "                 2\r\n" );
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document.write( "                   ____ \r\n" );
document.write( "             -4 ｱ ﾖ4ｷ34\r\n" );
document.write( "        x = 覧覧覧覧覧覧\r\n" );
document.write( "                 2 \r\n" );
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document.write( "                    __\r\n" );
document.write( "             -4 ｱ 2ﾖ34\r\n" );
document.write( "        x = 覧覧覧覧覧予r\n" );
document.write( "                 2\r\n" );
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document.write( "                      __\r\n" );
document.write( "             -4     2ﾖ34\r\n" );
document.write( "        x = 覧覧 ｱ 覧覧覧\r\n" );
document.write( "              2      2\r\n" );
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document.write( "        x = -2 ｱ ﾖ34 \r\n" );
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document.write( "Using the +, x = -2 + ﾖ34, which\r\n" );
document.write( "is one solution and equals about 3.830951895\r\n" );
document.write( "                       __ \r\n" );
document.write( "Using the -, x = -2 - ﾖ34, which\r\n" );
document.write( "is the other solution and equals about\r\n" );
document.write( "-7.830951895.\r\n" );
document.write( "However we discard this since a rectangle's sides \r\n" );
document.write( "aren't negative!\r\n" );
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document.write( "So width = x = 3.830951895, and length = x + 4 =\r\n" );
document.write( "3.830951895 + 4 = 7.830951895\r\n" );
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document.write( "Edwin
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