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kalo ngak salah
semoga dapat membantu
(3ˣ + 1/3ˣ)² = 16
(3ˣ - 1/3ˣ)² = (3ˣ + 1/3ˣ)² - 4
(3ˣ - 1/3ˣ)² = 16 - 4
3ˣ - 1/3ˣ = -2√3 atau 2√3