Question

Find an equation for the nth term of the arithmetic sequence.

Answer 1

1) To find out common equation for this sequence, it must be used n=1;2;3;4... etc.
2) to count a₁ use n=1. It is correct only for row  $a_n=-3+-2(n-1)$  result is (-3)
3) if to verify others value for n:

Answer 2

An = -3 + -2 (n) is the answer. To verify this, start replacing the"n" with numbers like so: 0, 1, 2, 3, 4, 5....etc