a+b+c ---->3,5,9,15,23
3a+b ---->2,4,6,8
2a ---->2,2,2
•2a=2
a=1
•3a+b=2
3.1+b=2
b=2-3
b=-1
•a+b+c=3
1-1+c=3
c=3
Rumus =an²+bn+c
=1n²-1n+3
=n²-n+3
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a+b+c ---->3,5,9,15,23
3a+b ---->2,4,6,8
2a ---->2,2,2
•2a=2
a=1
•3a+b=2
3.1+b=2
b=2-3
b=-1
•a+b+c=3
1-1+c=3
c=3
Rumus =an²+bn+c
=1n²-1n+3
=n²-n+3
Semoga membantu...