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2^(2x) + 2 . 2^x . 2^-x + 2^(-2x) = 9
4^x + 2 . 1 + 4^-x = 9
4^x + 4^-x + 2 = 9
4^x + 4^-x = 9 - 2
4^x + 4^-x = 7
Jawaban: C