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c. 6
x'log 2 + x'log(3x-4) = 2
x'log (2 (3x-4)) = 2
x'log(6x - 8) = 2
x² = 6x - 8
x² - 6x + 8 = 0
hasil kali akar-akar persamaan di atas adalah :
x1x2 = c/a = 8/1 = 8