Nilai x yg memenuhi persamaan 3^x2 - 2x - 7 = 1/81 adalah...

Persamaan eksponen

3^(x²-2x-7) = 1/81 = 1/3⁴ = 3⁻⁴
x² -2x -7 = - 4
x² -2x - 3 = 0
(x - 3)(x +1) = 0
x = 3 atau x = - 1