Jawab:
Penjelasan dengan langkah-langkah:
Un = a + (n - 1)b
U2 = a + (2 - 1)b
a + b = 2
U8 + U10 = - 24
a + (8 - 1)b + a + (10 - 1)b = -24
a + 7b + a + 9b = -24
2a + 16b = - 24 (disederhanakan dengan cara dibagi 2)
a + 8b = - 12
a + b = 2
a + 8b = - 12 _
- 7b = 14
b = 14/(-7) = - 2
a = 2 - (-2) = 4
U20 = a + (20 - 1)b
U20 = a + 19b
U20 = 4 + 19(-2)
U20 = 4 - 38
U20 = - 34.
Jadi, suku ke-20 adalah -34.
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Jawab:
Penjelasan dengan langkah-langkah:
Un = a + (n - 1)b
U2 = a + (2 - 1)b
a + b = 2
U8 + U10 = - 24
a + (8 - 1)b + a + (10 - 1)b = -24
a + 7b + a + 9b = -24
2a + 16b = - 24 (disederhanakan dengan cara dibagi 2)
a + 8b = - 12
a + b = 2
a + 8b = - 12 _
- 7b = 14
b = 14/(-7) = - 2
a = 2 - (-2) = 4
U20 = a + (20 - 1)b
U20 = a + 19b
U20 = 4 + 19(-2)
U20 = 4 - 38
U20 = - 34.
Jadi, suku ke-20 adalah -34.