Rumus suku ke n pada barisan bilangan bertingkat 5,9,15,23….adalah….
Jawaban Terkonfirmasi
Quadratic Sequence.
5, 9, 15, 23, …
a = 5
b = 4
c = 2
The n-th term formula is:
Un = a / 0! + b(n – 1) / 1! + c(n – 1)(n – 2) / 2!
= 5 / 0! + 4(n – 1) / 1! + 2(n – 1)(n – 2) / 2!
= n² + n + 3
