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= 2 + 3n - 3
= 3n - 1 (C)
7. a + b + c = 2
3a + b = 3
2a = 2 ... >> a = 1
3 (1) + b = 3
b = 3 - 3
b = 0
a + b + c = 2
1 + 0 + c = 2
c = 2 - 1
c = 1
rumus >>
Un = an^2 + bn + c
Un = 1.n^2 + 0.n + 1
jadi, rumusnya adalah
n^2 + 1 (D)
8. a + b + c = 1
3a + b = 5
2a = 4 ... >> a = 2
3 (2) + b = 3
b = 3 - 6
b = - 3
a + b + c = 1
2 - 3 + c = 1
c = 1 + 1
c = 2
rumus >>
Un = an^2 + bn + c
Un = 2.n^2 + - 3.n + 2
jadi, rumusnya
2n^2 - 3n + 2
atau
n ( 2n - 1) .. (A)