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descompunerea in factori (5a+7)la patrat -4b la patrat

Răspuns :

[tex](5a+7)^2-4b^2=(5a+7)^2-(2b)^2=\boxed{\bold{(5a+7+2b)(5a+7-2b)}};[/tex]
(5a+7)^2-4b^2
(5a-7)^2-(2b)^2
(5a+7+2b)(5a+7-2b)