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Calculaţi (2x – 3)(x + 2) – 2(3x – 4)2

Răspuns :

(2x-3)(x+2)-2(3x-4)²=2x²-3x+4x-6-2(9x²-4*3x*2+16)=2x²+x-6-18x²+48x-32=-16x²+49x-38