2014-05-15T12:33:34+08:00

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= 1
May be written as
log(3/5) 1 = x² - 7x -8
But log(3/5) 1 = 0    ;     so  x² - 7x -8 = 0

x² - 7x -8 = 0
(x-8)(x+1) = 0

Therefore, x = 8 ; x = -1
Recall that anything raised to 0 is equal to 1. That is why I equated the exponent to 0.
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