Réponse :
a. 4x^2 + 12x + 9 = (2x + 3)^2
b. 16x^2 - 40x + 25 = (4x - 5)^2
c. 9x^2 - 64 = (3x + 8)(3x - 8)
d. 49 - 70x + 25x^2 = (7 - 5x)^2
