tentukan lima suku pertama Un = 4 + 2n = 3n²

Materi : Aritmatika
Studi : SMP

Un = 4 + 2n = 3n²

Misal :
→ U(1) = 4 + 2(1) = 3(1)²
= 4 + 2 = 3
= 6 = 3 → = 6 - 3 = 3

→ U(2) = 4 + 2(2) = 3(4)
= 4 + 4 = 12
= 8 = 12 → 8 - 12 = -4

→ U(3) = 4 + 2(3) = 3(9)
= 4 + 6 = 27
= 10 = 27 → 10 - 27= -7

→ U(4) = 4 + 2(4) = 3(16)
= 4 + 8 = 48
= 12 = 48 → 12 - 48 = -24

→ U(5) = 4 + 2(5) = 3(25)
= 4 + 10 = 75
= 14 = 75 → 14 - 75 = -61


Sehingga lima suku pertamanya adalah :
3, -4, -7, -24 dan -61