Bfui gnoc so Sdjflk JsdkfK J Jlk JjLkj Kjlk Jl JklJkl Jlk Jlk JklJl Jkl Jl JlKjk Lj Lj LkjLk Jkl Jl KjLkj Lj lk(x+a)n=∑k=0n(nk)xkan−k