Question

Please help me ! I need to pass

Write a recursive formula for the following arithmetic sequence

8,12,16,20. ...

A1 =

An = For n _> 2

Answer 1

Explanation:

`a_1=8\\a_2=a_1+4=8+4=12\\a_3=a_2+4=12+4=16\\a_4=a_3+4=16+4=20\\\vdots\\\\a_n=\left\{\begin{array}{ccc}a_1=8\\a_n=a_(n-1)+4\end{array}\right`