Bonjour pouvez vous m'aider merci

Bonjour Coco,

Factorisation
A = 5x -xy = x(5-y)
B = 12ab + 12a = 12a (b +1)
C = (x-3) +2x (x-3) = (x-3) (+2x)
D = (5x +2y)( 5 +x) +2( 5x+2y) = (5x +2y)(5 +x +2) = (5x +2y) (+7 +x)
E = (7 -4x) (x+4) - (x +4) (7 +3x)
(x +4) (7-4x -7 -3x)
(x+4)(-7x)