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Buna!Imi puteti demonstra daca numarul a(a+1)(a+2)(a+3)+1 este patrat perfect?Multumesc anticipat!

Răspuns :

(a×a)+a×(a+2)×(a+3)+1=a^2+a×a+2a×(a+3)+1=a^2+a^2+2a×a+2a×3+1=a^2+a^2+2×a^2+2a×3+1=2 (a^2)+2 (a^2)+6a+1=4 (a^2)+6a+1=4a×4a+6a+1=16a+6a+1=22a+1