Penyelesaian persamaan eksponensial3^²x+¹-4.3^x+²= -81 adalah…Tolong dibantu secepatnya!!​

eksponen

3^(2x + 1) – 4 . 3^(x + 2) = – 81

3 . (3^x)² – 4 . 3² . 3^x + 81 = 0

(3^x)² – 12(3^x) + 27 = 0

(3^x – 9)(3^x – 3) = 0

3^x – 9 = 0

3^x = 9

x = 2

3^x – 3 = 0

3^x = 3

x = 1

x = {1 , 2}