Réponse :
Explications étape par étape
(a + b)(c - d) = ac - ad + bc - bd
(a - b)^2 = a^2 - 2ab + b^2
a^2 - b^2 = (a - b)(a + b)
Bonsoir
(x + 2)(3x - 1) = 3x^2 - x + 6x - 2 = 3x^2 + 5x - 2
(x - 1)^2 = x^2 - 2x + 1
(x - 1)^2 - 16 = (x - 1 - 4)(x - 1 + 4) = (x - 5)(x + 3)
x^2 - 36 = (x - 6)(x + 6)
