Quelqu'un peux m'aider svp!?:(

A = 8x-12
B= -15x-6
C= X2 + 10x +21
D= 6x2 -19x + 15

A = 4(2x-3)
A = 8x-12

B = -3x(5x+2)
B = -15x²-6x

C = (x+3)(x+7)
C = x²+7x+3x+21
C = x²+10x+21

D = (2x-3)(3x-5)
D = 6x²-10x-9x+15
D = 6x²-19x+15

E = 3a-15
E = 3(a-5)

F = 10x²+35x
F = 5x(2x+7)