Bonjour
D = (x - 2,5)²
D = x² - 5x + 6,25
E = (1 - x) (1 + x)
E = 1 + x - x - x²
E = - x² + 1.
F = (6 + x)²
F = 36 + 12x + x²
F = x² + 12x + 36
G = (x - 3) (x + 3)
G = x² + 3x - 3x - 9
G = x² - 9.
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Bonjour
D = (x - 2,5)²
D = x² - 5x + 6,25
E = (1 - x) (1 + x)
E = 1 + x - x - x²
E = - x² + 1.
F = (6 + x)²
F = 36 + 12x + x²
F = x² + 12x + 36
G = (x - 3) (x + 3)
G = x² + 3x - 3x - 9
G = x² - 9.