10. Efectuați calculele: a) (2x + 3)² +5(x-1)²-(3x + 1)²; c) (x+3)(x-3) - (x + 1)²; e) 9(x + 1)(x-1)-(3x + 1)²; g) 2(x + 5)²-4(x + 2)(x-2) + 2x(x-3). b) (4x - 3)²+(3x + 2)²-(5x-4)²; d) (x - 1)(x + 4)-(x + 2)(x-2); f) (3x + 5)(3x - 5) + (5x + 6)2-(x+5)(x - 5); ​