Factoriser : Niveau 3eme
bonjour je n'arrive pas a factoriser les calcul suivant :

1) ( x - 1) (x + 2 ) + ( x - 1) ( x + 4 )

2) ( 2x - 1 )² - ( 2x - 1 ) ( x + 3 )

3) x² - 4 + ( x - 2 ) ( 2x + 1 )

4) ( x - 1 )² - 4

5) ( x + 2 )² - ( 3 + 2x )²

Merci de votre aide :-)
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