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[tex](x-2)la puterea 2 -(x+3)inmultire
(x-3)[/tex]


Răspuns :

(x-2)²-(x+3)(x-3)=
x²-4x+4-(x²-9)=
x²-4x+4-x²+9=
-4x=-4-9
x=-13supra -4=> x=13supra4