3 log (x^2-2x) = 3log 8

Bab Logaritma
Matematika SMA Kelas X

³log (x² - 2x) = ³log 8
x² - 2x = 8
x² - 2x - 8 = 0
(x - 4) (x + 2) = 0
x - 4 = 0
x = 4

x + 2 = 0
x = -2

x² - 2x > 0
x (x - 2) > 0
x - 2 > 0
x > 2

x < 0

maka
x = -2 atau x = 4