The first four terms of an AP whose first term is - 2 and the common difference is - 2 are
First term, a = - 2
Second Term, d = - 2
a1 = a = - 2
a2 = a + d = - 2 + (- 2) = - 4 (using formula an = a + (n - 1)d)
similarly
a3 = - 6
a4 = - 8
so A.P is
- 2, - 4, - 6, - 8