Answer: 8
Explanation:
From our knowledge, we know two things.
- f(n + 1) = f(n) + 2
- f(2) = 4
From here, we can work out what f(3) is by substituting n as 2
f(2 + 1) = f(2) + 2
f(3) = 4 + 2 = 6
And we can work out f(4) by substituting n as 3
f(3 + 1) = f(3) + 2
f(4) = 6 + 2 = 8
Eventually, if you continue doing this, you will see a sequence forming where the next number is the previous number added by 2.