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n^2+1

or use absolute value |x|

x=0?

|x|+1 maybe..

yes, that will work.

the answer is 2n^2, but how could i figure that out...preparing for test

answer cannot be 2n^2, since for n=0, 0 is not a positive integer..

thats the answer they gave in the book

2n^2+1 or 2n^2+2.... are possible solution but not that one

ok cool thanks