2 log x + 2 log (x-6)=4

²log x + ²log (x - 6) = 4
²log x(x - 6) = 4
x(x - 6) = 2⁴
x² - 6x - 16 = 0
(x - 8)(x + 2) = 0
x = 8 atau x = -2

Syarat numerus : > 0

NiLai x yg memenuhi :
x = 8