Risolvi l'espressione
(1 + a)^4·(a + 2) - 2·(1 + a)^5=
=(1 + a)^4·((a + 2) - 2·(1 + a))=
=(a^4 + 4·a^3 + 6·a^2 + 4·a + 1)·(-a)=
=- a^5 - 4·a^4 - 6·a^3 - 4·a^2 - a
http://www.wolframalpha.com/input?i=simplify+%281--a%29%E2%81%B4%28a--2%29-2%281--a%29%E2%81%B5
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