bjr
comme k (a + b) = k * a + k * b
on aura
A = 4x * 8 + 4x * (-6x) = 32x - 24x²
et
B = -2 * 2x - 2 * (-4) = -4x + 8
inversement
on a ka + kb = k (a+b)
soit
C = 10 * 2 - 10 * 3a = 10 (2 - 3a)
et
D = (4x - 5)(2 - x) + (4x - 5) (4x - 5)
= (4x - 5) [(2 - x) + (4x - 5)]
= (4x - 5) (3x - 3)
= 3 (4x - 5) (x - 1)
