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how to solve a sequence

Sagot :

[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]