Form?
( x + y ) n = ( n 0 ) x n y 0 + ( n 1 ) x n − 1 y 1 + ( n 2 ) x n − 2 y 2 + ⋯ + ( n n ) x 0 y n , {\displaystyle (x+y)^{n}={\binom {n}{0}}x^{n}y^{0}+{\binom {n}{1}}x^{n-1}y^{1}+{\binom {n}{2}}x^{n-2}y^{2}+\cdots +{\binom {n}{n}}x^{0}y^{n},}

Copy pasted from wikipedia but also not but for credit visit the previous wiki page =] Dunno what else to tell yah =] Just gotta keep writin' lines for yah to separate the text oki this should be enough now =]

{\displaystyle (x+y)^{n}=\sum _{k=0}^{n}{\binom {n}{k}}x^{n-k}y^{k}=\sum _{k=0}^{n}{\binom {n}{k}}x^{k}y^{n-k},}