Cari x(x + 1) - (2x - 7) = (3x - 6) - (x + 1)x + 1 - 2x + 7 = 3x - 6 - x - 1-x + 8 = 2x - 72x + x = 8 + 73x = 15x = 5Barisan aritmatika(2x - 7), (x + 1), (3x - 6)(10 - 7), (5 + 1), (15 - 6)3, 6, 9makaa = 3b = 6 - 3 = 3jumlah 12 suku.pertamaSn = n/2 (2a + (n - 1)b)S12= 12/2 (2(3) + (12 - 1)(3))S12 = 6 (6 + 33)S12 = 6 x 39S12 = 234
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Cari x
(x + 1) - (2x - 7) = (3x - 6) - (x + 1)
x + 1 - 2x + 7 = 3x - 6 - x - 1
-x + 8 = 2x - 7
2x + x = 8 + 7
3x = 15
x = 5
Barisan aritmatika
(2x - 7), (x + 1), (3x - 6)
(10 - 7), (5 + 1), (15 - 6)
3, 6, 9
maka
a = 3
b = 6 - 3 = 3
jumlah 12 suku.pertama
Sn = n/2 (2a + (n - 1)b)
S12= 12/2 (2(3) + (12 - 1)(3))
S12 = 6 (6 + 33)
S12 = 6 x 39
S12 = 234