Answer:
b. f(n) = 2n^2 + 1
Step-by-step explanation:
Thanks for explaining the nth thing to me. It all makes sense now :'D
I'll be honest I think you're at least a grade level above me in math.
It's b. because
f(n) = 2(1)^2 + 1
2(1) + 1
2 + 1 = 3 (first term)
f(n) = 2(2)^2 + 1
2(4) + 1
8 + 1 = 9 (second term) ...and so on. :)