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Verified answer
³log (x-2) - ³log (x-4) = ³log (x-2)³log = ³log (x-2)
(x-2) / (x-4) = (x-2)
(x-2) = (x-4) (x-2)
x-2 = x² - 6x + 8
x² - 6x - x + 8 + 2 = 0
x² - 7x + 10 = 0
(x - 5)(x - 2) = 0
x₁ = 5
x₂ = 2
jadi nilai x yang memenuhi adalah 2 atau 5 (E)
Verified answer
3log (x - 2) - 3log (x - 4) = 3log (x - 2)3log (x - 2) = 3log (x - 2) + 3log (x - 4)
3log (x - 2) = 3log (x - 2)(x - 4)
3log (x - 2) = 3log (x^2 - 6x + 8)
x - 2 = x^2 - 6x + 8
0 = x^2 - 7x + 10
=> (x - 5)(x - 2) = 0
=> x = 5 atau x = 2
Seharusnya jawabannya x = 5 saja
Karena dalam logaritma ada syaratnya
3log(x - 4) ==> (x - 4) > 0 => x > 4
dan yang lebih dari 4 yaitu x = 5
Jika x = 2 maka
Nilai
3log(x - 2) = 3log(2 - 2) = 3log 0 = tak ada ,,, (coba 3 pangkat berapa yg isinya 0)
Begitu juga dengan
3log (x - 4) = 3log (2 - 4) = 3log (-2)