Fill in each blank so that the resulting statement is true.

Consider the statement 3 + 7 + 11 + g+ (4n - 1) = n(2n + 1).
If n = 1, the statement is 3 = 1(2 + 1).
If n = 2, the statement is 3 + 7 = 2(4 + 1).
If n = 3, the statement is________ .
If n = k + 1, the statement before the algebra is simplified is ___________.
If n = k + 1, the statement after the algebra is simplified is ___________.