Bonsoir pouvez vous m'aider à ces exercices svp? (29 et 33). Merci d'avance. Thomas

Salut ! :)

Exercice 29

1) (x + 4) × (x + 3) = x×x + x×3 + 4×x + 4×3
2) (x - 5)(x + 6) = x×x + x×6 + (-5)×x + (-5)×6
3) (x - 7)(x - 2) = x×x + x×(-2) + (-7)×x + (-7)×(-2)
4) (2x + 3)(3x + 1) = 2x×3x + 2x×1 + 3×3x + 3×1

Exercice 33

1) 4(x - 5) = 4×x + 4×(-5) = 4×x + (-20) = 4×x - 20
6(-x + 2) = 6×(-x) + 6×2 = -6×x + 12

2) 4(x - 5) = 6(-x + 2)
4×x - 20 = -6×x + 12
4×x + 6×x = 12 + 20
10×x = 32
x = 32/10 = 3.2

Voilà :)