document.write( "Question 35087: log (x+21) + log x = 2 \n" ); document.write( "
Algebra.Com's Answer #21298 by stanbon(75887)![]() ![]() ![]() You can put this solution on YOUR website! log (x+21) + log x = 2 \n" ); document.write( "log[x(x+21)]=2 \n" ); document.write( "x(x+21)=10^2=100 \n" ); document.write( "x^2+21x-100=0 \n" ); document.write( "(x+25)(x-4)=0 \n" ); document.write( "x=-25 or x=4 \n" ); document.write( "x=-25 is extraneous as you see if you put that value into the original problem. \n" ); document.write( "x=4 is a valid solution. \n" ); document.write( "Cheers, \n" ); document.write( "Stan H.\r \n" ); document.write( "\n" ); document.write( " \n" ); document.write( " |