Question

What is the recursive rule for an=3n+5?

a1=8;an=an−1+3

a1=5;an=an−1+3

a1=3;an=an−1+5

a1=8;an=an−1+5

Answer 1

answer is a1=8;an=an−1+3

Explanation:

got 100 on the test

Answer 2

Option A

Explanation:

Given that an = 3n+5

Substitute 1 to get I term as

a1 = 3(1) +5 = 8

Hence I term is 8

II term = a2 = 3(2)+5 = 11

d = common difference = a2-a1 = 11-8 =3

Hence it is an arithmetic progression with I term as 8 and common differnce as d. So 3 is added to each term to get next term.

Recursive rule

`a_(n) =a_(n-1) +3`