document.write( "Question 1207661: Find the real solutions of the equation. \r
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document.write( "2x^(-2) - 3x^(-1) - 4 = 0\r
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document.write( "I then decided to rewrite the original equation this way:\r
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document.write( "(2/x^2) - (3/x) - 4 = 0\r
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document.write( "Stuck here.... \n" );
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Algebra.Com's Answer #845666 by ikleyn(52781)![]() ![]() You can put this solution on YOUR website! .\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Be aware: the solution and the answer by @Theo are incorrect.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "One can see it even with unarmed eye. Indeed, in Theo's equation \r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( " 2k^2 - 3k - 4 = 0\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "the leading coefficient \" 2 \" is positive, while the constant term \" -4 \" is negative. \n" ); document.write( "It implies that the roots of this equation must be with opposite signs; \n" ); document.write( "while Theo gives both roots positive at the end of his solution, which is wrong.\r \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( " \n" ); document.write( " |