Question

How to solve a sequence

Answer 1

For the first sequence

Let a1 = 2

2, 9, 16, 23, ...

Recursive Formula

`a_n=a_(n-1)+7`

Explicit Formula

`a_n=2+7(n-1)`

For the second sequence

Let a1 = 2

2, 14, 98, 686, ...

Recursive Formula

`a_n=7(a_n-1)`

Explicit Formula

`a_n=2\cdot7^(n-1)`