Réponse :
a) x(7x+5) = 0 => x = 0 ou 7x+5 = 0 => x = -5/7
b) (x+3)(4 + x - 5 ) = 0 => (x+3)(x-1) = 0 => x+3 = 0 => x = -3 ou x-1 = 0 => x = 1
c)(3x+1)(x-5+3x-4) = 0 => (3x+1)(4x-9) = 0 => 3x+1 = 0 => x = -1/3
4x-9 = 0 => x = ou x = 9/4
Bonne soirée
Explications étape par étape
