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12 cards from this deck
Second differences are constant
Differences between consecutive terms
Differences between the first differences
Tn=an2+bn+cT_n = an^2 + bn + cTn=an2+bn+c
The term you're trying to find
Position of term in sequence
2a2a2a equals the second difference
aaa is half the second difference
Find the second difference
Use first two terms to create two equations
a=1a = 1a=1
Tn=n2+3T_n = n^2 + 3Tn=n2+3
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