Bonsoir,
A = (x - 3)(2x + 1)
A = (2x² + x - 6x - 3)
A = 2x² - 5x - 3
B = (x - 3) - 3 + 2(7x + 5)
B = x - 3 - 3 + 14x + 10
B = 15x + 4
C = (2x + 5)(5 + x)
C = (10x + 2x² + 25 + 5x)
C = 2x² + 15x + 25
D = (2x + 7)²
D = 4x² + 14x + 49
E = (3 - 2x)²
E = 9 - 12x + 4x²
F = (2x - 5)(2x + 5)
F = 4x² - 25
Bonne soirée :)