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a² - a = 2
a² - a - 2 = 0
(a - 2) (a + 1) = 0
a = 2 atau a = -1
² log x = 2
x = 2² = 4
² log x = -1
x = 2^(-1) = 1/2
maka nilai x yang memenuhi persamaan tersebut yaitu x = 4 atau x = 1/2