Bonjour,
Factoriser :
H = (3x-4)²-(6x+1)²
H = (3x-4-(6x+1))(3x-4+(6x+1))
H = (3x-4-6x-1)(3x-4+6x+1)
H = (-3x-5)×3(3x-1)
H = 3(-3x-5)(3x-1)
Bonne journée.
