Bonjour,
A=4y-36 =4(y-9)
B= 5x-5 =5(x-1)
C=(2x+1) (2x+5)+3(2x+1) =(2x+1)((2x+5)+3)=(2x+1)(2x+8)=(2x+1)(x+4)*2
D=(x+4)(6-x)-(x+4)(7-2x) =(x+4)((6-x)-(7-2x))=(x+4)(x-1)
E=(7x-2)(5x-1)+(3x-4)(5x-1) =(5x-1)((7x-2)+(3x-4))=(5x-1)(10x-6)=(5x-1)(5x-3)*2
F=81x²-54x+9 =(9x-3)²
G=25-36x² =(5-6x)(5+6x)
H=100+60y+9y² =(10+3*y)²
I=(2x-5)(3x+8)-(3x+8)²=(3x+8)((2x-5)-(3x+8)=(3x+8)(-x-13)
J=(5x+4)²-81=(5x-5)(13+5x)