For the first sequence
Let a1 = 2
2, 9, 16, 23, ...
Recursive Formula
[tex]a_n=a_{n-1}+7[/tex]Explicit Formula
[tex]a_n=2+7(n-1)[/tex]For the second sequence
Let a1 = 2
2, 14, 98, 686, ...
Recursive Formula
[tex]a_n=7(a_n-1)[/tex]Explicit Formula
[tex]a_n=2\cdot7^{n-1}[/tex]