SOLUTION: log(base7)x+log(base7)(x-1)=log(base7)12

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Question 737008: log(base7)x+log(base7)(x-1)=log(base7)12
Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
log(base7)x+log(base7)(x-1)=log(base7)12
log%287%2C%28x%29%29%2Blog%287%2C%28x-1%29%29=log%287%2C%2812%29%29
x%28x-1%29=12
x%5E2-x-12=0
(x-4)(x+3)=0
x=-3 (reject, x>0)
x=4