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9^x + 9^(-x) = 98
Anggap demikian:
Sehingga:
9^x + 2 + 9^(-x) = 98 + 2
Menjadi:
100 = (3^x)² + 2(3^x)(3^(-x)) + (3^x)²
100 = (3^x + 3^(-x))²
Didapat:
3^x + 3^(-x) = √100
3^x + 3^(-x) = 10