document.write( "Question 2882: What is (log3 x)^2 = log3 x^2 + 3.
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document.write( "The answer in the answers part is 27 and 1/3.
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document.write( "Thank you. \n" );
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Algebra.Com's Answer #1261 by khwang(438)![]() ![]() ![]() You can put this solution on YOUR website! Since log3 x^2 = 2 log3 x, \n" ); document.write( " (log3 x)^2 = log3 x^2 + 3 converts to\r \n" ); document.write( "\n" ); document.write( " (log3 x)^2 - 2log3 x - 3 = 0.\r \n" ); document.write( "\n" ); document.write( " Let u = log3 x, we have u^2 - 2u -3 =0, \n" ); document.write( " Factoring (u-3)(u+1) =0, \n" ); document.write( " So, u =3 or -1. \n" ); document.write( " Hence, log3 x = 3,u = 3^3 = 27 or \n" ); document.write( " log3 x = -1,u = 3^(-1) = 1/3\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( " \n" ); document.write( " |