document.write( "Question 247085:
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document.write( "I am confused on how to simplify this fraction. The text book says the answer is not 2x-8, which is what I would have come up with. It says, \"choose the value of X to show that this answer is not true.\" I am confused. The problem is:\r
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document.write( "2X^2-32/x-4\r
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document.write( "Thanks, Lynda (attempting to teach my son algebra) \n" );
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Algebra.Com's Answer #180311 by nerdybill(7384)![]() ![]() You can put this solution on YOUR website! \n" ); document.write( "2X^2-32/x-4 \n" ); document.write( ". \n" ); document.write( "Factoring a 2 from the numerator: \n" ); document.write( "[2(X^2-16)]/x-4 \n" ); document.write( "[2(X+4)(X-4)]/x-4 \n" ); document.write( "Canceling x-4: \n" ); document.write( "2(X+4) \n" ); document.write( "2X+8 \n" ); document.write( ". \n" ); document.write( "This will NOT be true if X=4 -- notice the denominator goes to zero making it undefined. \n" ); document.write( " \n" ); document.write( " |