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3^(2x + 1) - 63 . 9^(x - 1) + 108 ≥ 0
3 . 3^2x - 63 . 3^(2x - 2) + 108 ≥ 0
3 . 3^2x - 63 . 3^2x /3^2 + 108 ≥ 0
3 . 3^2x - 7 . 3^2x + 108 ≥ 0
-4 . 3^2x ≥ -108
3^2x ≤ -108/-4
3^2x ≤ 3^3
2x ≤ 3
x ≤ 3/2

Jawab : opsi C