document.write( "Question 316967: why isn't ln(12 + x) = (ln12)(lnx), What is the rule that disproves this.
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Algebra.Com's Answer #226889 by Fombitz(32388) $\"\"$ $\"About$

You can put this solution on YOUR website!
There is no rule to disprove it but there clearly isn't a rule that proves it.
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\n" ); document.write( "Example: $\"ln%2812%2B0%29=ln%2812%29%2Aln%280%29\"$ doesn't work since $\"ln%280%29\"$ is undefined but yet ln(12) is defined.
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\n" ); document.write( " $\"ln%28AB%29=ln%28A%29%2Bln%28B%29\"$ is the only rule that really works.
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