Question

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

Question 7 options:

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

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

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

A(n) = A(n - 1) + 9

Answer 1

A(n)=A(n-1)+2 since A(n)=d+A(n-1)

Answer 2

A(n)= 2+ 9(n-1)
A(n)=9n-7
A(n-1)=9n-16
=(9n-7)-9
=A(n) - 9
the result is A(n-1)=A(n)-9