Question

A(n)= 4 + (n - 1)(-5)
what’s the recursive formula

Answer 1

A(1)=4

A(n)= A(n-1)-5

Explanation:

Plug in 1 to see that a(1)=4. Then, find a few more using the given formula and see what the change is from one to the next. It ends up subtracting 5 for every value.