document.write( "Question 260775: what is log4 to base2 with the addition of log7 to base2 then subtract logX to base 2=1 \n" ); document.write( "

Algebra.Com's Answer #192103 by drk(1908) $\"\"$ $\"About$

You can put this solution on YOUR website!
We have
\n" ); document.write( " $\"log%282%2C4%29+%2B+log%282%2C7%29+-+log%282%2Cx%29+=+1\"$
\n" ); document.write( "by rules of logs we get
\n" ); document.write( " $\"log%282%2C28%2Fx%29+=+1\"$
\n" ); document.write( "rewriting as powers, we get
\n" ); document.write( " $\"2%5E1+=+28%2Fx\"$
\n" ); document.write( "so,
\n" ); document.write( "x = 14. \n" ); document.write( "

\n" );