Posted by 4611star on Sunday, February 19, 2012 at 10:36am.
Left side
= (n-1)^2 + n + (n+1)^2
= n^2 - 2n + 1 + n + n^2 + 2n + 1
= 2n^2 + n + 2
≠ 3n+2
the statement is false
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