(x+a)^n=∑ (k=0)^n▒〖(n¦k) x^k a^(n-k) 〗

(x+a)^n=∑ (k=0)^n▒〖(n¦k) x^k a^(n-k) 〗is an equation who floats around in space.

Friends
He is friends with Mo.