document.write( "Question 893267: LOGx + LOG(x-15) = 2 Solve for x. Answer is 20 but I can not figure out how to get it. If it was log base 8 x + log base 8 (x-15) = 2 I can figure it out.
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Algebra.Com's Answer #541192 by ankor@dixie-net.com(22740)![]() ![]() You can put this solution on YOUR website! LOGx + LOG(x-15) = 2 Solve for x. \n" ); document.write( "Adding logs is multiply \n" ); document.write( " \n" ); document.write( "The exponent equiv \n" ); document.write( "x(x-15) = 10^2 \n" ); document.write( "x^2 - 15x = 100 \n" ); document.write( "x^2 - 15x - 100 = 0 \n" ); document.write( "Factors to \n" ); document.write( "(x - 20) (x + 5) = 0 \n" ); document.write( "only the positive solution is valid here \n" ); document.write( "x = 20 \n" ); document.write( " |