If f (1) = 7 and f (n) = f (n - 1) - 4 then find the value of f (6).

- 13

Step-by-step explanation:

f (1) = 7

f (n) = f (n - 1) - 4

f (₂) = f (1) - 4 = 7 - 4 = 3

f (₃) = f (₂) - 4 = 3 - 4 = - 1

f (₄) = f (3) - 4 = (-1) - 4 = - 5

f (₅) = f (₄) - 4 = ( - 5) - 4 = - 9

f (₆) = f (₅) - 4 = ( - 9) - 4 = - 13