2pangkat x-1= 8 pangkatx+2

Persamaan eksponen

2ˣ⁻¹ = 8ˣ⁺²
(2)ˣ⁻¹  = (2³)ˣ⁺²
.
x - 1 = 3(x +2)
x - 1 = 3x + 6
x- 3x = 6 + 1
-2x = 7
x = - 7/2

2^(x-1) = 8^(x+2)
2^(x-1) = 2^(3(x+2))
x - 1 = 3x + 6
2x = -7
x = -7/2