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Verified answer
3^2x + 8 . 3^(x - 1) - 1 = 0(3^x)² + 8 . 3^x /3 - 1 = 0 ... kalikan 3
3 (3^x)² + 8 . 3^x - 3 = 0
(3 . 3^x - 1)(3^x + 3) = 0
3 . 3^x - 1 = 0
3^x = 1/3
3^x = 3^-1
x = -1