B= (3x-2)(5-4x)-3(7x-2)
B = 15x - 12x^2 - 10 + 8x - 21x + 6
B = -12x^2 + 2x - 4 D= 5 (4x-1)-(2x+3)(-5x -7)
D = 20x - 5 - (-10x^2 - 14x - 15x - 21)
D = 20x - 5 + 10x^2 + 29x + 21

Bonjour une personne ma aider a faire mon devoir mais je ne sais pas a quoi correspond ^ pouvez vous m'aider
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