An arithmetic sequence is represented by the explicit formula A(n) = 2 + 9(n - 1). What is the recursive formula?
A. A(n) = A(n - 1) + 9

B. A(n) = A(n - 1) - 9

C. A(n) = A(n - 1) + 2

D. A(n) = A(n - 1) - 2

Question

An arithmetic sequence is represented by the explicit formula A(n) = 2 + 9(n - 1). What is the recursive formula?
  A. A(n) = A(n - 1) + 9
 	
  B. A(n) = A(n - 1) - 9
 	
  C. A(n) = A(n - 1) + 2
 	
  D. A(n) = A(n - 1) - 2

campbell_st · Answer

what is being added to each term to get the next... look at the sequence

n = 1     2

n = 2     11

n = 3     20


etc

so its the previous term plus...?

anonymous · Answer

A:) If you try out A(1) = 2, A(2) = 11, A(3) = 20. The common factor is 9. So, A(n) = A(n-1) + 9