2pangkat x+1=4 akar 8 pangkat x+5

^ tanda pangkat
2^(x+1) = ⁴√8^(x+5)
2^(x+1) = ⁴√2^3(x+5)
2^(x+1) = 2^(3x+15)/4
x + 1 = (3x + 15)/4
4(x + 1) = 3x + 15
4x + 4 = 3x + 15
4x - 3x = 15 - 4
x = 11