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2. 9^x - 3^(x+1) + 1 = 0
2. (3^x)² - 3. 3^x + 1 = 0
2a² - 3a + 1 = 0
(2a-1)(a - 1) = 0
a = 1/2 atau a = 1
3^x = 1/2 3^x = 1
x = ³log1/2 3^x = 3^0
x = 0
Jadi x = 0 atau x = ³log1/2