The recursive formula [tex] f(n+1)=f(n)+5 [/tex] means that the next term in the sequence is 5 more than the previous one.
So, we know that we start from [tex] f(0)=3 [/tex], which means that the next term is
[tex] f(1) = f(0)+5 = 3+5 = 8 [/tex]
Similarly,
[tex] f(2) = f(1)+5 = 8+5 = 13 [/tex]