Aidez moi svp
B(y) = (7-3y)²
E(x) = (x + 7)(x-7)
H(u) = (3u-1)(3u + 1)
C(x) = (3-x)²
F(x) = (1 + 3x)²
I(x) = (4x + 9) (4x - 9)