Question

F(n + 1) = f(n) – 3. If f(4) = 22, what is f(1)?

Answer 1

f(1) = 31.

Explanation:

f(n + 1) = f(n) - 3

So f(4) = f(3) - 3

22 = f(3) - 3

f(3) = 22 + 3 = 25

so f(2) = 25 + 3 = 28

and f(1) = 28 + 3 = 31.