Tentukan 10 suku pertama jika Un=2 (n-1) Un=3n+7 Tolong di bantu besok di kumpul kan

Jawaban nya 121
Maaf kalau salah ya
Jawaban ada difoto yang saya kirim
Terima kasih

a.
Un = 2 (n-1)
U1 = 2 (1-1)
U1 = 2.0
U1 = 0

U2 = 2 (2-1)
U2 = 2.1
U2 = 2

U3 = 2 (3-1)
U3 = 2.2
U3 = 4

U4 = 2 (4-1)
U4 = 2.3
U4 = 6

U5 = 2 (5-1)
U5 = 2.4
U5 = 8

U6 = 2 (6-1)
U6 = 2.5
U6 = 10

U7 = 2 (7-1)
U7 = 2.6
U7 = 12

U8 = 2 (8-1)
U8 = 2.7
U8 = 14

U9 = 2 (9-1)
U9 = 2.8
U9 = 16

U10 = 2 (10-1)
U10 = 2.9
U10 = 18

Jadi, 10 suku pertamanya adalah
(0,2,4,6,8,10,12,14,16,18)

b.
Un = 3n + 7
U1 = 3.1 + 7
U1 = 3 + 7
U1 = 10

U2 = 3.2 + 7
U2 = 6 + 7
U2 = 13

U3 = 3.3 + 7
U3 = 9 + 7
U3 = 16

U4 = 3.4 + 7
U4 = 12 + 7
U4 = 19

U5 = 3.5 + 7
U5 = 15 + 7
U5 = 22

U6 = 3.6 + 7
U6 = 18 + 7
U6 =25

U7 = 3.7 + 7
U7 = 21 + 7
U7 = 28

U8 = 3.8 + 7
U8 = 24 + 7
U8 = 31

U9 = 3.9 + 7
U9 = 27 + 7
U9 = 34

U10 = 3.10 + 7
U10 = 30 + 7
U10 = 37

Jadi, 10 suku pertamanya adalah
(10,13,16,19,22,25,28,31,34,37)


Semoga membantu