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Verified answer
A = 8b = 12 - 8 = 4
u20 = 8 + (20 - 1)4
u20 = 8 + (19)4
u20 = 8 + 76
u20 = 84 ⇒ jawaban.
maka Un = 4n + 4
pembuktian Un
U1 = 4n +4
= 4.1 + 4
= 8
U2 = 4n + 4
= 4.2 + 4
= 12
jadi, U20
U20 = 4n + 4
= 4.20 +4
= 80+4
= 84
semoga membantu, maaf klo salah