document.write( "Question 154390: How do I solve an equation by factoring, if the sum in a fraction?\r
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document.write( "EXAMPLE: 6x + 7 = 20/x \n" );
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Algebra.Com's Answer #113683 by ankor@dixie-net.com(22740)![]() ![]() You can put this solution on YOUR website! 6x + 7 = 20/x \n" ); document.write( "; \n" ); document.write( "Multiply both sides by x to get rid of the denominator \n" ); document.write( "x(6x + 7) = 20 \n" ); document.write( ": \n" ); document.write( "Mult terms inside the brackets: \n" ); document.write( "6x^2 + 7x = 20 \n" ); document.write( "; \n" ); document.write( "Subtract 20 from both sides to reveal our old friend, the quadratic equation \n" ); document.write( "6x^2 + 7x - 20 = 0 \n" ); document.write( ": \n" ); document.write( "With diligent effort we can factor this to: \n" ); document.write( "(2x + 5)(3x - 4) = 0 \n" ); document.write( "Two solutions \n" ); document.write( "2x = -5 \n" ); document.write( "x = \n" ); document.write( "x = -2.5 \n" ); document.write( "and \n" ); document.write( "3x = 4 \n" ); document.write( "x = \n" ); document.write( "; \n" ); document.write( ": \n" ); document.write( "Check the 1st solution in the original equation \n" ); document.write( "6(-2.5) + 7 = \n" ); document.write( "-15 + 7 = -8 \n" ); document.write( "; \n" ); document.write( "Check the 2nd solution \n" ); document.write( "6* \n" ); document.write( "8 + 7 = 15 \n" ); document.write( " |