A(x) =4(3x+1)² - 36
=(6x+2-6)(6x+2+6)
=(6x-4)(6x+8)
B(x) = x²+4x+4-9(x²-4)
=(x+2)²-9(x+2)(x-2)
=(x+2)(x+2-9x+18)
=(x+2)(-8x+20)
C(x)=(x²-9)-25(x²-6x+9)
=(x+3)(x-3)-25(x-3)²
=(x-3)(x+3-25x+75)
=(x-3)(-24x+78)
D(x)=x²+2racine carrée2x+2-3(x+racine carrée2)
=(x+rac(2))²-3(x+rac(2))
=(x+rac(2)(x+rac(2)-3)
