Bonsoir,
E(x) = 5(6x - 2) + 2(2 - 5x) = 30x - 10 + 4 - 10x = 20x - 6
F(x) = 3(2x - 1) - 2(1 + 3x) = 6x - 3 - 2 + 6x
= 12x - 1
G(x) = (x + 4)(2x + 3) - (x² + x - 1) =
2x² + 3x + 8x + 12 - x² + x - 1 =
x² + 12x + 11
H(x) = (4 - x)(3x - 2) =
12x - 8 - 3x² - 2x =
10x - 8 - 3x²
Tu peux faire le reste maintenant.