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3^2.3^x + 3/3^x = 28
9.3^x + 3/3^x - 28 = 0
misal, 3^x = a
9a + 3/a - 28 = 0
9a^2 + 3 - 28a = 0
9a^2 - 28a + 3 = 0
(a - 3)(9a - 1) = 0
a = 3 atau a = 1/9
3^x = 3
x = 1
3^x = 1/9
x = 3^(-2)
x = -2
Jadi, nilai x yang memenuhi adalah 1 atau -2