bonjour
A = 3 ( x + 1) + ( x + 1 ) ( x + 2 )
= ( x + 1) ( 3 + x + 2 )
= ( x + 1 ) ( x + 5 )
B = ( x + 3 ) ( 2 x + 1 + 7 )
= ( x + 3 ) ( 2 x + 8 )
= 2 ( x + 3 ) ( x + 4 )
C = ( 2 x - 1 ) ( 5 + x + 3 )
= ( 2 x - 1 ) ( x + 8 )
D = ( 3 x + 6 ) ( 2 x - 1 - 5)
= ( 3 x + 6 ) ( 2 x - 6 )
= 3 ( x + 2 ) ( 2 x - 3 )
tu fais pareil pour le 4
