Réponse :
Bonsoir,
A= 121x²-49
= (11x -7) (11x+7)
Identité remarquable
B= 36x²-60x
= 12x (3 x -5)
C= 36x²-60x+25
=(6x -5) ²
identité remarquable
D= (x+6) (5x-1) - (x+6) (7x+12)
= (x+6) ( 5x-1 - 7x+12)
= (x+6) ( -2x +11)
E = (x-5)² - 16
=(x-5 -4) (x-5+4)
= (x-9 ) ( x-1)
IR