Just need to expand

Expand the following:
(n+4)^2

(n+4) (n+4) = (n) (n) + (n) (4) + (4) (n) + (4) (4):
n n+4 n+4 n+4 4

n n = n^2:
n^2+4 n+4 n+4 4

4×4 = 16:
n^2+4 n+4 n+16

4 n+4 n = 8 n:
Answer: |n^2+8n+16