2. Efectuați calculele:
a) (2x + 3)[5(x – 3) – 3(x – 4)] – 4(x + 1)2;
b) (3x - 4)[7(x + 4) – 4(x + 6)) -(3x + 2)2;
c) 4(2x - 1)2 – (4x + 1)[7(x - 4) – 3(x - 9)];
d) (2x + 3)[(x - 1)- (- 2)) - 4(x - 2)(x + 2);
e) (2x + 5)[(x - 2) - (x-3)?) - 4(x + 1)(x - 1);
1) (2x + 7)[(x - 3)- - (1-4)?] - 4(x - 3)(x + 3).
calcul prescurtat:​