Réponse :
bonsoir
2 x ( x² - 1 ) - x ( x + 1 )
= 2 x ( x - 1 ) ( x + 1 ) - x ( x + 1 )
= ( x + 1 ) [ 2 x ( x - 1 - x )]
= ( x + 1 ) [ 2 x ( - 1 ) ]
= ( x + 1 ) ( - 2 x )
Explications :
