Bonjour;

1)

A = 6x+9

B= -2x+1

C = -3x² +x

2)

A = 3x-12

b = 20x +10

C = -20x +30

E = 9x² +6x +3x +2 = 9x² +9x +2

F = 16x² +4x-4x -1 = 16x² -1

3)

A = 2( x+4)

B= (3-x)(3+x)  identité remarquable

C = (3x-1) ( 3x-1 -5x +1) = (3x-1) ( -2x )