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kali 2 tiap ruas
2.²log (x - 2) - ²log (2x² - 12x + 19) = 0
²log (x - 2)² - ²log (2x² - 12x + 19) = ²log 1
²log (x - 2)² = ²log 1 + ²log (2x² - 12x + 19)
²log (x - 2)² = ²log (2x² - 12x + 19)
(x - 2)² = (2x² - 12x + 19)
x² - 4x + 4 = 2x² - 12x + 19
pindah ruas
x² - 8x + 15 = 0
(x - 5) (x - 3) = 0
x = 5,3
Diketahui α < β
maka
α = 3 dan β = 5
sehingga
nilai dari 2α - β = 2 x 3 - 5 = 6 - 5 = 1