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[tex](2x - 1) {}^{2} - 4( x + 3) {}^{2} = [/tex]


Răspuns :

(2x-1)²-4(x+3)²=


4x²-4x+1+4(x²+6x+9)=


4x²-4x+1+4x²+24x+36=


(4x²+4x²)+(-4x+24)+(1+36)=


8x²+20x+37