A sequence of numbers is defined by the expression a(subscript n) = 3n + n^2

Question

Which sequence corresponds to this expression?

A)4, 9, 12, 20
B)4, 10, 18, 28
C)4, 10, 15, 20
D)5, 10 ,15 20

Question:
What am I supposed to do here?
How would I solve this?

Answer 1

replace the expression with
n = 1 , 2, 3, and 4 and see which sequence matches your results.

I will do one of them
if n = 2
a₂ = 3(2) + 2^2 = 10
(that would be your second number)