document.write( "Question 614936: What is 3log x+6 log (x-2) written as a single logarithm? \n" ); document.write( "
Algebra.Com's Answer #386792 by Theo(13342)![]() ![]() You can put this solution on YOUR website! 3*log(x) + 6*log(x-2) would be equivalent to: \n" ); document.write( "log(x^3) + log((x-2)^6) which would then be equivalent to: \n" ); document.write( "log(x^3 * (x-2)^6) \n" ); document.write( "the 2 properties of logarithms that are used are: \n" ); document.write( "log(a*b) = log(a) + log(b) \n" ); document.write( "log(a^b) = b*log(a) \n" ); document.write( "you need to apply them in the correct order. \n" ); document.write( "assume you started with: \n" ); document.write( "log(x^3 * (x-2)^6) \n" ); document.write( "you would use log(a*b) = log(a) + log(b) to get: \n" ); document.write( "log(x^3) + log(x-2)^6) \n" ); document.write( "you would then use log(a^b) = b*log(a) to get: \n" ); document.write( "3*log(x) + 6*log(x-2) \n" ); document.write( "to confirm you have the correct answer, substitute random values for x and solve using the original equation and the final equation to see if you get the same answer with each. \n" ); document.write( "assuming x is equal to 9, solve each in turn. \n" ); document.write( "original equation: \n" ); document.write( "3*log(x) + 6*log(x-2) is equal to: \n" ); document.write( "3*log(9) + 6*log(9-2) which is equal to: \n" ); document.write( "3*log(9) + 6*log(7) which is equal to: \n" ); document.write( "7.933315768 \n" ); document.write( "final equation: \n" ); document.write( "log(x^3 * (x-2)^6) is equal to: \n" ); document.write( "log(9^3 * (9-2)^6) which is equal to: \n" ); document.write( "log(9^3 * 7^6) which is equal to: \n" ); document.write( "log(729 * 117649) which is equal to: \n" ); document.write( "log(85766121) which is equal to: \n" ); document.write( "7.933315768 \n" ); document.write( "the answer are the same so you can reasonably assume that the conversion was done successfully.\r \n" ); document.write( "\n" ); document.write( " \n" ); document.write( " |