Answer :
[tex]\begin{gathered} \text{Let:} \\ a_1=2 \\ \text{ Recursive formula}\colon \\ a_n=a_{n-1}+7 \\ \text{Explicit formula:} \\ a_n=2+7(n-1) \end{gathered}[/tex][tex]\begin{gathered} \text{Let:} \\ a_1=2 \\ \text{ Recursive formula:} \\ a_n=7(a_{n-1}) \\ \text{Explicit formula:} \\ a_n=2\cdot7^{n-1} \end{gathered}[/tex]