Jika 9^x + 9^-x = 51, maka 3^x - 3^-x = ...
Matematika
Alfarizvin
Pertanyaan
Jika 9^x + 9^-x = 51, maka 3^x - 3^-x = ...
1 Jawaban
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1. Jawaban Anonyme
9^x + 9^-x = 51
(3^x)² + 1/(3^x)² = 51
(3^x - 1/3^x)² + 2 = 51
3^x - 1/3^x = √(51 - 2)
3^x - 3^-x = 7