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a fost răspuns

6x inmultit (3x-1)-7x inmultit(4x+5)
(x+5)(x-3)
(5x-7)(5x-7)
(3x+5)(3x+5)
4x inmultit (x-2)
AJUTOR!!!!!

Răspuns :

6·(3x-1) -7x(4x+5) = 18x-6-28x²-35x= -28x²-17x-6
(x+5)(x-3)= x²-3x+5x-15 =x²+2x-15;
(5x-7)(5x-7)= 25x²-35x-35x+49 = 25x²-70x+49;am folosit formula (a-b)²=a²-2ab+b²
(3x+5)(3x+5)= 9x²+15x+15x+25= 9x²+30x+25;am folosit form. (a+b)² = a²+2ab+b²
4(x-2)= 4x-8

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