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+4 +6 +8
+2 +2
U1 = a+b+c
U2 = 4a+2b+c
U3 = 9a+3b+c
dst.
a+b+c , 4a+2b+c , 9a+3b+c , dst
3a+b, 5a+b, dst
2a
2a = 2 ( dari pola yg paling atas )
Maka a=1
3a+b = 4
3(1)+b = 4
b=1
a+b+c = 0
1+1+c = 0
c = -2
Rumusnya tinggal dimasukin ke :
Un = an²+bn+c
Un = (1)n²+1(n) + (-2)
Un = n²+n-2
Rumusnya bisa dicoba :v