Bonjour
A= 4x(2x-1)
B= (2x+5) ( x +3x-1)
= (2x+5) ( 4x-1)
C= (x-6) ( 2x+3 -x+6)
= (x-6) ( x +9)
D = (x-5)² identité remarquable
E = (6x+1)² IR
F = (5-3x+1) ( 5 +3x+1)
= ( -3x+6) ( 3x +6) IR
( a²-b²)
