Write a recursive formula for the following arithmetic sequence. -19,-15,-11,-7

Question

Write a recursive formula for the following arithmetic sequence.

-19,-15,-11,-7

Answer 1

Let a₁=-19

a₂=a₁+4=-15

a₃=a₂+4=-11

a₄=a₃+4=-7

So, the recursive formula is

a_n=a_n-1+4