Answer:
Substitute the first four positive integers.
Step-by-step explanation:
let n = {1, 2, 3, 4}
a_n = n² + 8
a_1 = (1)² + 8
a_1 = 1 + 8
a_1 = 9
a_2 = (2)² + 8
a_2 = 4 + 8
a_2 = 12
a_3 = (3)² + 8
a_3 = 9 + 8
a_3 = 17
a_4 = (4)² + 8
a_4 = 16 + 8
a_4 = 24
