I got 340 because
10*10 is 100
Then 12*10 is 120 divid by 4 because there is 4 sides

Use mathematical induction to prove the statement is true for all positive integers n, or show why it is false. 1^2 + 4^2 + 7^2 + + (3n - 2)^2 = [n(6n^2-3n-1)/2]