document.write( "Question 20718: CAN SOMEONE, ANYONE PLEASE PLEASE HELP ME!!! I really need help. What is the value of X in the equation, log(2x+8) - log
(2x^2+21x+61) = -3 \n" );
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Algebra.Com's Answer #9980 by venugopalramana(3286)![]() ![]() You can put this solution on YOUR website! i think you mean logs are to base 2..taking that and using the formula, \n" ); document.write( "log x to base y = log x/log y \n" ); document.write( "so we get \n" ); document.write( "log(2x+8)/log 2+log (2x^2+21x+61)/log 2=-3 \n" ); document.write( "multiplying through out with log 2 \n" ); document.write( "log(2x+8)+log(2x^2+21x+61)=-3log 2=log 2^(-3)==log(1/2^3)=log(1/8) \n" ); document.write( "log(2x+8)(2x^2+21x+61)=log(1/8) \n" ); document.write( "(2x+8)(2x^2+21x+61)=(1/8) \n" ); document.write( "i hope now you can continue from here \n" ); document.write( "to simplify and factorise to get the answers \n" ); document.write( " |