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Posted by **4611star** on Sunday, February 19, 2012 at 10:36am.

(n-1) squared + n + (n+1)squared = 3n +2

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**Reiny**, Sunday, February 19, 2012 at 10:58amLeft 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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