If f (1) = 9 and f (n) = f (n-1) + 2 then find the value of f (5)

Step-by-step explanation:

hello:

f (n) = f (n-1) + 2

means : f (n) - f (n-1) = 2

this is the arithmetic seq when the common dif is d = 2 and the first term is : 9

the n-ieme term is : f (n) = f (1) + (n-1) d

f (n) = 9+2 (n-1)

f (n) = 2n+7

so : f (5) = 2 (5) + 7 = 17