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October 21, 2014

October 21, 2014

Posted by **kristina** on Sunday, December 2, 2012 at 8:53pm.

log(5x+7)=1+log(x-9)

- math;SOS -
**Reiny**, Sunday, December 2, 2012 at 9:39pmlog(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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