document.write( "Question 1094365: 1/x+1/x+1=9/20
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Algebra.Com's Answer #708925 by ikleyn(52781) $\"\"$ $\"About$

You can put this solution on YOUR website!
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document.write( "    If it is  \r\n" );
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document.write( "     = \r\n" );
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document.write( "    then, after multiplying both sides by x*(x+1), you have\r\n" );
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document.write( "    20*(x+1) + 20*x = 9x*(x+1)  ====>  20x + 20 + 20x = 9x^2 + 9x  ====>\r\n" );
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document.write( "    9x^2 - 31x - 20 = 0  ====>  after factoring the left side ====>  \r\n" );
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document.write( "    (9x+5)*(x-4) = 0  ====>  the solutions are   x =   and  x = 4.\r\n" );
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\n" ); document.write( "\n" ); document.write( "Second part of my answer\r
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\n" ); document.write( "\n" ); document.write( "Your formula is ambiguous and unreadable without using parentheses.\r
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document.write( "     Is it   (1/x) + (1/x) + 1 = (9/20)    or   (1/x) + (1/(x+1)) = 9/20  ??\r\n" );
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\n" ); document.write( "\n" ); document.write( "Use parentheses to make your formulas readable and unambiguous.\r
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\n" ); document.write( "\n" ); document.write( "Use parentheses when you post your formulas to this forum.\r
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\n" ); document.write( "\n" ); document.write( "It is the REQUIREMENT of this site.\r
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\n" ); document.write( "\n" ); document.write( "There is NO OTHER WAY to make them readable and unambiguous.\r
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\n" ); document.write( "\n" ); document.write( "By violating this RULE, you work against yourself and against your better interests.\r
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\n" ); document.write( "\n" ); document.write( "With it, welcome to the forum !!\r
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\n" ); document.write( "I repeat this mantra to each and every new visitor coming to this forum,\r
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document.write( "    Once, when I sent this message to some customer/\"student\"/visitor, he responded me (through the \"Thank you\" form),\r\n" );
document.write( "    asking why he (or she ?) should use parentheses when his source (textbook, teacher's assignment sheet and so on)\r\n" );
document.write( "    does not contain these parentheses ?\r\n" );
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\n" ); document.write( "\n" ); document.write( "Good question ! \r
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document.write( "     The answer is: That sources have TYPOGRAPHY MEANS to represent the fractions, writing them in two levels /\r\n" );
document.write( "     numerators and denominators, divided by horizontal lines.\r\n" );
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document.write( "     Such typography tools ABSENT in this forum, THEREFORE the customers SHOULD write parentheses to present numerators and denominators\r\n" );
document.write( "     explicitly.\r\n" );
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\n" ); document.write( "\n" ); document.write( "Hope this explanation makes this issue absolutely clear.\r
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