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Verified answer
Bab Barisan dan DeretMaematika SMP Kelas IX
Sn = 4n² + 7
Un = Sn - S(n - 1)
Un = 4n² + 7 - (4 (n - 1)² + 7)
Un = 4n² + 7 - (4 (n² - 2n + 1) + 7)
Un = 4n² + 7 - 4n² + 8n - 11
Un = 8n - 4
U(n + 3) = 8(n + 3) - 4
= 8n + 24 - 4
= 8n + 20