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Coroana !!!Descompuneti in factori 25(2x+3)^2-36(2x-1)^2 =

Răspuns :

25(2x+3)^2-36(2x-1)^2 =
=5(2x+3)-6(2x-1)×5(2x+3)+6(2x-1) =
=(10x+15-12x+6)(10x+15+12x-6) =
=(21-2x)(22x+9)