Which of the following recursive formulas represents the same geometric sequence as the formula an = 2 + (n-1)5?

Question

A. {a₁ = 5

{a_n = (a_n-1+5) 2

B. {a₁ = 2

{a_{n =} a_n-1 x 5

C. {a₁ = 5

{a_n = a_n-1 + 2

D.{a₁ = 5

{a_n =a_n-1 +5

Answer 1

Emma, it is hard to show you how, without doing the work.

actyally, I think there must be a transcription error, as I believe all four answers are wrong ( in fact, answer A isn’t even well formed)

The formula increases by 5 for each member, and only one answer (D) increases by 5.

The formula shows that a₁ = 2, only one answer (B) agrees.

If one answer satisfied both of those conditions, it would be a candidate. But neither answer can be right, unless there’s an error in the problem.

Please repost with the exact problem.

Answer 2

I feel the answer is B because the 5 is multiplied.