1/(4+x)
= 1/(6 + (x-2))
= 1/6 / ( 1 - (- 1/6(x-2)))
= 1/6 * 1/( 1 - (- 1/6(x-2))) | Formel für geometrische Reihen für | -1/6 (x-2)| < 1
= 1/6 * ( 1(x-2)^0 - 1/6 (x-2)^1 + (1/6(x-2))^2 - (1/6(x-2))^3 + ......)
= 6^{-1}(x-2)^0 - 6^{-2}(x-2)^1 + 6^{-3}(x-2)^2 - 6^{-4}(x-2)^3 + ...
= Σ_(k=0)^{∞} (-1)^k (6)^{-1-k} (x-2)^k