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(x+2)^2 - 49 desc fact comuni

Răspuns :

[tex] (x+2)^{2} -49[/tex]=(x+2+7)(x+2-7)=(x+9)(x-5)

(x+2)²-7²=
(x+2-7)(x+2+7)=
(x-5)(x+9)