document.write( "Question 811931: I have a problem trying to solve this logarithm. log base 3 (x^2+1)=4
\n" ); document.write( "log3(x^2+1)=4. According to the log rules of logb(+/-) it can be rearranged unless it's multiplication and division, but this has something in the parentheses so how would I go about solving this? \n" ); document.write( "

Algebra.Com's Answer #489034 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"log%283%28x%5E2%2B1%29%29\"$ = 4
\n" ); document.write( "The exponent equiv of logs
\n" ); document.write( "(x^2+1) = $\"3%5E4\"$
\n" ); document.write( "x^2 + 1 = 81
\n" ); document.write( "x^2 = 81 - 1
\n" ); document.write( "x^2 = 80
\n" ); document.write( "x = $\"sqrt%2882%29\"$
\n" ); document.write( "x = $\"sqrt%2816%2A5%29\"$
\n" ); document.write( "x = $\"4sqrt%285%29\"$ \n" ); document.write( "

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