document.write( "Question 1073878: Show that log25+log4-log2-log5=1 \n" ); document.write( "

Algebra.Com's Answer #688652 by Edwin McCravy(20060) $\"\"$ $\"About$

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document.write( "Group the first two and the last two (taking out a -\r\n" );
document.write( "in the last two changes the - signs inside the parentheses\r\n" );
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document.write( "Use the principle that the SUM of two logs of numbers is \r\n" );
document.write( "the log of their PRODUCT:\r\n" );
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document.write( "Use the principle that the DIFFERENCE of two logs of numbers is \r\n" );
document.write( "the log of their QUOTIENT: \r\n" );
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document.write( "The 2 on the bottom cancels into the 4 on the top and gives 2 on top.\r\n" );
document.write( "The 5 on the bottom cancels into the 25 on the top and gives 5 on top.\r\n" );
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document.write( "The log of 10 in base 10 is 1.\r\n" );
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document.write( "Therefore it is proved.\r\n" );
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document.write( "Edwin

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