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descompuneti in factori
(5a+7)la puterea 2-4b la puterea a 2


Răspuns :

[(5a-7)-2b]*[(5a-7)+2b]=[tex] (5a-7)^{2}-4b^{2} [/tex]
Sper ca e bine
[tex](5a+7)^2-4b^2=(5a+7)^2-2^2b^2=(5a+7)^2-(2b)^2 \\\;\\ =(5a+7-2b)(5a+7+2b)[/tex]