document.write( "Question 387299: Solve for x: log(x+1) + (log(x-1) = log8. \n" ); document.write( "

Algebra.Com's Answer #273766 by nerdybill(7384) $\"\"$ $\"About$

You can put this solution on YOUR website!
log(x+1) + (log(x-1) = log8
\n" ); document.write( "log(x+1)(x-1) = log8
\n" ); document.write( "log(x^2-1) = log8
\n" ); document.write( "x^2-1 = 8
\n" ); document.write( "x^2 = 9
\n" ); document.write( "x = {-3, 3}
\n" ); document.write( "Testing for extraneous solutions eliminates -3 leaving you with:
\n" ); document.write( "x = 3
\n" ); document.write( " \n" ); document.write( "

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