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4 9
5
bawah 2A=5 ------->A=5/2
tengah 3A+B=4
3(5/2)+B=4 ------->B=-7/2
atas A+B+C=2
5/2-7/2+C=2 -------->C=6/2
Un=An²+Bn+C
Un=5/2n²-7/2n+6/2
Un=1/2(5n²-7n+6) ---->Rumus Suku ke n
U10=1/2(5.10²-7.10+6)=218
U100=1/2(5.100²-7.100+6)=24653
U20=1/2(5.20²-7.20+6)=933