Jika f(×) = × + 2, maka f (× +1)

f(x) = x + 2
f(x+1) = x + 1 + 2
= x + 3

(maaf kalo salah)

caranya :
f(x) = x + 2
f(x+1) = x + 1 + 2 
= x + 3
semoga membantu!