2 pangkat (x-1 )+ 2 pangkat (x) + 2pangkat (x +1 )+ 2 pangkat (x +2) / 15 = 8

Jawab

[2^(x - 1) + 2^(x) + 2^(x + 1) + 2^(x + 2)] / 15 = 8

2^x [1/2 + 1 + 2 + 2²] / 15 = 8
2^x . (15/2) / 15 = 8
2^x = 2 × 8
x = 4