Répondre :
B=4x²+20x+25
=(2x+5)²
C=(3x+1)²-4
=(3x+1-2)(3x+1+2)
=(3x-1)(3x+3)
D=(2x-3)+(2x-3)²
=(2x-3)+(2x-3)(2x-3)
=(2x-3)(1+2x-3)
=(2x-3)(2x-2)
=2(2x-3)(x-1)
=(2x+5)²
C=(3x+1)²-4
=(3x+1-2)(3x+1+2)
=(3x-1)(3x+3)
D=(2x-3)+(2x-3)²
=(2x-3)+(2x-3)(2x-3)
=(2x-3)(1+2x-3)
=(2x-3)(2x-2)
=2(2x-3)(x-1)