Explications étape par étape:
Exercice 6 :
3x -> 3×(-2) = -6
7+5x -> 7+ 5×(-2) = -3
6x+4 -> 6×(-2)+4 = -8
9-x -> 9+2 = 11
5-4x -> 5-4×(-2) = 13
x^2 -> (-2)^2 = 4
x^3 -> (-2)^3 = -8
x^3 - x^2 = (-2)^3 - (-2)^2 = -12
Exercice 7 :
1 -> c 2(x+8)
2 -> a 2x+8
3 -> b x+8×2
