bonjour
tu appliques la double distributivité
A = x² + 2 x + 3 x + 6 = x² + 5 x + 6
B = 2 x² + 4 x + 6 x + 12 = 2 x² + 10 x + 12
C ) x² + 9 x - 7 x - 63 = x² + 2 x - 63
d = 4 x - x² - 12 + 3 x = - x² + 7 x - 12
E = 15 x² - 21 x + 20 x - 28 = 15 x² - x - 28
F = - 8 x + 2 x² + 32 - 8 x = 2 x² - 16 x + 32
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bonjour
tu appliques la double distributivité
A = x² + 2 x + 3 x + 6 = x² + 5 x + 6
B = 2 x² + 4 x + 6 x + 12 = 2 x² + 10 x + 12
C ) x² + 9 x - 7 x - 63 = x² + 2 x - 63
d = 4 x - x² - 12 + 3 x = - x² + 7 x - 12
E = 15 x² - 21 x + 20 x - 28 = 15 x² - x - 28
F = - 8 x + 2 x² + 32 - 8 x = 2 x² - 16 x + 32