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)\"\" \"About 
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( "\"log%28%28x%28x-15%29%29%29+=+2\"
\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
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