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Verified answer
Saya gak pake LaTex, ya.1 - x > 0
-x > -1
x < 1
Misal, 2log(1 - x) = a, maka (2log(1 - x))^2 = a^2, 2log(1 - x)^2 = 2.2log(1-x) = 2a
sehingga
a^2 - 8 > 2a
a^2 - 2a - 8 > 0
(a - 4)(a + 2) > 0
a < -2 atau a > 4
2log(1 - x) < -2
2log(1 - x) < 2log2^(-2)
1 - x < 2^(-2)
1 - x < 1/4
-x < 1/4 - 1
-x < -3/4
x > 3/4
2log(1 - x) > 4
2log(1 - x) > 2log2^4
1 - x > 2^4
-x > 16 - 1
-x > 15
x < -15
Jadi, didapatkan batas-batasnya, x > 3/4 atau x < -15 dan x < 1
Jadi,
3/4 < x < 1 atau x < -15