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3,..6,...10
....3....4
........1
a= 3, b = 3, c= 1
deret tingkat 2
Un = a/1 + (n-1)b + 1/2 (n-1)(n-2)c
Un = 3 + 3n - 3 + 1/2(n^2 - 3n+2)
Un = 1/2 n^2 - 3/2n + 1 + 3n
Un = 1/2n^2 +3/2 n + 1
un = 1/2( n^2 + 3n + 2)
Misalkan Un = an² + bn + c
3 -- 6 -- 10
3 4
1
2a = 1
a = 1/2
3a + b = 3
3(1/2) + b = 3
b = 3/2
a + b + + c = 3
1/2 + 3/2 + c = 3
c = 1
Un = (1/2)n² + (3/2)n + 1