Respuesta :

Answer:

First 3 terms are 3, 8, 15.

10th term  = 120.

Step-by-step explanation:

an = n^2 + 2n

a1 = 1^2 + 2*1 = 3

a2 = 2^2 + 2*2 = 8

a3 = 3^2 + 2*3 = 15.

a10 = 10^2 + 20 = 120.