Question

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

Answer 1

$(a^2+4)(a+2)(a-2) = \\ \\ = (a^2+4)(a^2-2^2) = \\ \\ = (a^2+4)(a^2-4) = \\ \\ = {(a^2)}^2 - 4^2 = \\ \\ = a^4-16$