Question

How to solve this??​

Answer 1

log9 x + log9 (x-8) =1 using a couple of log properties, we have

log9 [ (x)(x - 8) ] = log9 9 so we have

(x)(x - 8) = 9 simplify

x^2 - 8x - 9 = 0 factoor

(x - 9) (x + 1) = 0 and setting each factor to 0, we have x = 9 and x = -1 .. reject the negative answer..

So, therefore x = 9...

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