Nilai n yang memenuhi : a.2n + 8 = 12 b.5 (n pangkat) x 125 = 25 (Pakai cara)

a. 2n + 8 = 12
2n = 12-8
2n= 4
n= 2

b. 5^n × 125 = 25
5^n × 5^3 = 5^2
5^n+3 = 5^2
n+3 = 2
n = 2-3
n = -1

Bab Aljabar
Matematika SMP Kelas IX

a] 2n + 8 = 12
    2n = 12 - 8
    n = 4 / 2
    n = 2

b] 5ⁿ x 125 = 25
    5ⁿ = 25/125
    5ⁿ = 1/5
    5ⁿ = 5⁻¹
    n = -1