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Descompune : 4x la puterea a 2 -12x+9


Răspuns :

[tex]\displaystyle 4x^2-12x+9=4x^2-6x-6x+9=2x(2x-3)-3(2x-3)= \\ =(2x-3)(2x-3)=(2x-3)^2[/tex]