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U1=a²+b+c=1
U2=4a+2b+c=8
U3=9a+3b+c=15
Persamaan 4=4a+2b+c=8
a² +b +c=3
3a+b =5
Persamaan 5=9a+3b+c=15
4a+2b+c=8
5a+b=7
Persamaan 6=5a+b=7
3a+b=5
2a=2, a=1
2a⇒3a+b =5
b=2
Jadi, Un=1n²+2n+0
U20=1.20²+2.40+0=40+80=120
Maaf kalau salah :)