SOLUTION: Give an expression for the nth term: 2, 6, 12, 20, 30, 42...is n^2+n but how did they get that answer?

Algebra ->  Sequences-and-series -> SOLUTION: Give an expression for the nth term: 2, 6, 12, 20, 30, 42...is n^2+n but how did they get that answer?       Log On


   

Question 706720: Give an expression for the nth term: 2, 6, 12, 20, 30, 42...is n^2+n but how did they get that answer?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Give an expression for the nth term: 2, 6, 12, 20, 30, 42...is n^2+n but how did they get that answer?
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Some people see patterns that other people do not.
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2 = 1^2 + 1
6 = 2^2 + 2
12 = 3^2+ 3
20 = 4^2+ 4
etc
Cheers,
Stan H.