document.write( "Question 165949: solve the equation log4(x+3)+log4(x-3)=2 \n" ); document.write( "

Algebra.Com's Answer #122304 by oscargut(2103) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"log4%28x%2B3%29%2Blog4%28x-3%29=2\"$
\n" ); document.write( "then
\n" ); document.write( " $\"log4%28%28x%2B3%29%28x-3%29%29=2\"$
\n" ); document.write( "then
\n" ); document.write( " $\"%28x%2B3%29%28x-3%29=4%5E2\"$
\n" ); document.write( "then
\n" ); document.write( " $\"x%5E2-9=16\"$
\n" ); document.write( "then
\n" ); document.write( " $\"x%5E2=25\"$
\n" ); document.write( "then
\n" ); document.write( " $\"x=5\"$ or $\"x=-5\"$
\n" ); document.write( "but if x=-5 then log4(x+3) not exists
\n" ); document.write( "so solution is\r
\n" ); document.write( "\n" ); document.write( " $\"x=5\"$ \r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

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