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(a la puterea a doua+4)(a+2)(a-2)

Răspuns :

[tex] (a^2+4)(a+2)(a-2) = \\ \\ = (a^2+4)(a^2-2^2) = \\ \\ = (a^2+4)(a^2-4) = \\ \\ = {(a^2)}^2 - 4^2 = \\ \\ = a^4-16[/tex]