Bonjour
(a-b) (a+b) = a² -b²
a)
identité remarquable
(x+1-2) (x+2 +2) =
(x-1) ( (x+4)
b)
(3-2x+1) (3 +2x-1) =
4-2x) ( 2+2x)
c)
(x+1 -x +1) ( x+1 +x-1)=
2 ( 2x )
d)
(y+3) (x-1 -2)=
( y+3) ( x-3)
