Vous pourriez m'aider pour l'exercice 3 svp?

bonsoir

A = ( x + 5 ) ( x + 3 - 3 )

=  x ( x + 5 )

B = ( x - 4 ) ( 2 x + 3  + 3 x - 5 )

= ( x - 4 ) ( 5 x - 2 )

C =  ( 3 x - 1 ) ( x - 2 - 2 x - 5 )

= ( 3 x - 1 ) ( - x  - 7 )

D =  ( 2 x + 3 ) ( x - 7 )

E = ( x + 7 ) ( x + 1 - 1 )

= x ( x + 7 )

F = ( 2 x - 5 ) ( 2 x - 5 - x - 2 )

= ( 2 x - 5 ) ( x - 7 )

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

=  2 x ( 2 x + 1 )

H = ( x - 8 ) ( x - 8 + 1 )

= ( x  - 8) ( x - 7 )