Question

Complete the recursive formula of the arithmetic sequence 9,-1,-11,-21

Answer 1

Explanation:

`a_1=9\\a_2=a_1-10=9-10=-1\\a_3=a_2-10=-1-10=-11\\a_4=a_3-10=-11-10=-21\\\vdots\\\\a_n=\left\{\begin{array}{ccc}a_1=9\\a_n=a_(n-1)-10\end{array}\right`