document.write( "Question 822027: log3 15 − log3 40 + log3 648 \n" ); document.write( "
Algebra.Com's Answer #853869 by MathTherapy(10801)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "log3 15 − log3 40 + log3 648\r\n" );
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document.write( "I take it you need this SIMPLIFIED!!\r\n" );
document.write( "\"log+%283%2C+%2815%29%29+-+log+%283%2C+%2840%29%29+%2B+log+%283%2C+%28648%29%29%29\"\r\n" );
document.write( "\"log+%283%2C+%2815%2F40+%2A+648%29%29\" ----- Applying \"log+%28b%2C+%28c%29%29+-+log+%28b%2C++%28d%29%29+%2B+log+%28b%2C+%28e%29%29%29\" = \"log+%28b%2C+%28c%2Fd+%2A+e%29%29\" \r\n" );
document.write( "\"log+%283%2C+%283cross%2815%29%2F8cross%2840%29+%2A+648%29%29\" = \"log+%283%2C+%283%2F8+%2A+648%29%29\" = \"log+%283%2C+%283%2Fcross%288%29+%2A+81cross%28648%29%29%29\" = \"log+%283%2C+%283%2881%29%29%29\" = \"log+%283%2C+%283+%2A+3%5E4%29%29\" = \"log+%283%2C+%283%5E5%29%29\" = 5
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