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[tex] (x-3)^{2}+(x+3)*(x-3)+(x+3)^2[/tex]

Răspuns :

(x-3)²+(x+3)×(x-3)+(x+3)²=
=x²-6x+9+x²-9+x²+6x+9=
=3x²+9=
=3(x²+3)