Penjelasan dengan langkah-langkah:
7, 12, 21, 34, 51, ... → a = 7
...5...9...13...17..... → b = 5
......4....4.....4.... → c = 4
Un = a + (n - 1) . b + 1/2 . (n - 1) . (n - 2) . c
Un = 7 + (n - 1) . 5 + 1/2 . (n² - 3n + 2) . 4
Un = 7 + 5n - 5 + 2 . (n² - 3n + 2)
Un = 5n + 2 + 2n² - 6n + 4
Un = 2n² - n + 6
Detail jawaban
Kelas 9
Mapel 2 - Matematika
Bab 2 - Barisan dan Deret Bilangan
Kode Kategorisasi : 9.2.2
#backtoschool2019
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Penjelasan dengan langkah-langkah:
7, 12, 21, 34, 51, ... → a = 7
...5...9...13...17..... → b = 5
......4....4.....4.... → c = 4
Un = a + (n - 1) . b + 1/2 . (n - 1) . (n - 2) . c
Un = 7 + (n - 1) . 5 + 1/2 . (n² - 3n + 2) . 4
Un = 7 + 5n - 5 + 2 . (n² - 3n + 2)
Un = 5n + 2 + 2n² - 6n + 4
Un = 2n² - n + 6
Detail jawaban
Kelas 9
Mapel 2 - Matematika
Bab 2 - Barisan dan Deret Bilangan
Kode Kategorisasi : 9.2.2
#backtoschool2019