log(x-1)+log(x-3)=log(x-1)

Logaritma
SMA Kelas X

log(x - 1) + log(x - 3) = log(x - 1)
log[(x - 1)(x - 3)] = log(x - 1)
log(x² - 4x + 3) = log(x - 1)

x² - 4x + 3 = x - 1
x² - 4x - x + 3 + 1 = 0
x² - 5x + 4 = 0
(x - 4)(x - 1) = 0

x - 4 = 0
x = 4

x - 1 = 0
x = 1 (Tidak memenuhi)

Penyelesaian : x = 4