n2 + n2 + n2 n=3
I THINK you are asking what is n^2 + n^2 + n^2 when n=3 ??? If that is what you are asking:
3^2 + 3^2 + 3^2 = 9 + 9 + 9 = 27
ANOTHER way n^2 + n^2 + n^2 = 3 n^2 = 3 (3^2) = 3 (9) = 27