Réponse :
Bonjour
1)
A = 4x² + 5x + 3x + 8 = 4x² + 8x + 8
B = -7x - 6 + x² + 2x + 4 = x² - 5x - 2
2)
C = 5(3 + 6x = 5×3 + 5×6x = 15 + 30x = 30x + 15
D = 5x² - 4x(3 - 7x) = 5x² - 4x×3 - 4x×(-7x) = 5x² - 12x + 28x² = 33x² - 12x
3)
E = 5x² + 9x = x(5x + 9)
F = 8x - 24 = 8(x - 3)
