Nomor 4 yang bisa tolong yaa

Bab Eksponensial
Matematika SMP Kelas IX

2ˣ + 2ˣ⁺³ = 72
2ˣ + 2ˣ . 2³ = 72
2ˣ + 2ˣ . 8 = 72
2ˣ + 8 . 2ˣ = 72
9 . 2ˣ = 72
2ˣ = 72 : 9
2ˣ = 8
2ˣ = 2³
x = 3

HP = { 3 }