Réponse:
A = 4 - {3x}^{2} - (2x - 5)(6 - x)
= 4 - {3x}^{2} - 12x - {2x}^{2} - 30 - 5x
= { - 5x}^{2} - 17x - 26
B = (3x - 7)^{2}
= (3x - 7)^(3x - 7)
= 9x^{2} - 21x - 21x + 49
= 9x^{2} - 42x + 49
C = 81 - 36x^{2}
= 3(12x - 27)
D = 16x - 4 + 8x^{2}
= 2(8x - 2 + 4x^{2})
