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2^ -1 log x^2 + 2x < 2 log 1/8 (2 log 1/8 = -3)
-2 log x^2 + 2x < -2 log 8 (1/8 = 8^ -1)
maka : x^2 + 2x < 8
x^2 + 2x - 8 < 0
(x+2)(x-4) < 0
x = -2 , x =4