Bonjour,
on factorise: (IR)
(3x-2 - 8) ( 3x-2 +8 ) = 0
(3x-10) ( 3x +6) = 0
soit
3x-10 = 0
3x= 10
x = 10/3
3x+6 = 0
3x=-6
x= -6/3
x= -2
