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b = 5
Suku terakhir, suku ke-n 37
Un = a + (n - 1)b
37 = -8 + (n - 1)(5)
37 = -8 + 5n - 5
37 = -13 - 5n
5n = 50
n = 10
b. Un = a+(n-1)b
Un = -8+(n-1)5
Un = -8 + 5n - 5
Un = 5n - 13
U3 = 5 x 3 - 13
U3 = 15 - 13
U3 = 2
U5 = 5 x 5 - 13
U5 = 25 - 13
U5 = 12
U6 = 5 x 6 - 13
U6 = 30 -13
U6 = 17
U8 = 5 x 8 - 13
U8 = 40 - 13
U8 = 27
U30 = 5 x 30 -13
U30 = 150 -13
U30 = 137
2. a. Aritmetika naik
12, 36. 108, 324 ( selalu naik)
b. Aritmetika naik
-40, 28, -16, -4 ( selalu naik, semakin sedikit minusnya semakin besar nilainya).
c. Aritmetika turun
b = -3
7, 4, 1, -2...)nilai semakin mengecil, semakin ke bawah semakin berkurang)
d. Aritmetika turun
10, 8, 6, 4, 2
b = -2 (nilai semakin mengecil)
e. Aritmetika turun
1, -5, -11. -17, -23
b = -6
(nilai ke bawah makin kecil)