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Posted by kristina on Sunday, December 2, 2012 at 8:53pm.
solve the logarithmic equation. log(5x+7)=1+log(x-9)
log(5x+7) - log(x-9) = 1 , condition: x > 9 log [ (5x+7)/(x-9) ] = 1 (5x+7)/(x-9 = 10^1 10x - 90 = 5x + 7 5x =97 x = 97/5 = 19.4
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