Réponse :

expressions de forme a²-b² qu'on factorise (a-b)(a+b)

L = (x + 1)²-9

L = (x+1-3)(x+1+3)

L = (x-2)(x+4)

M = (x + 3)²-(x + 1)²​

M =(x+3-x-1)(x+3+x+1)

M = (2x+2)(2x+4)

M=4(x+1)(x+2)

Bonjour,

L = (x + 1)²-9

iR: a² -b²

(x+1 -3) (x+1+3)

= (x-2) ( x+4)

M = (x + 3)²-(x + 1)²​

id

(x+3+x +1) ( (x+3 -x -1)

(2x +4)( 2)