bonjour
I = ( 7 x + 8 + 3 x + 4 ) ( 7 x + 8 - 3 x - 4 )
I = ( 10 x + 12 ) ( 4 x + 4 )
I = 8 ( 5 x + 6 ) ( x + 1 )
J = ( 3 x + 4 + 5 x - 2 ) ( 3 x + 4 - 5 x + 2 )
J = ( 8 x + 2 ) ( - 2 x + 6 )
J = 4 ( 4 x + 1 ) ( - x + 3 )
K = ( 5 x + 8 - 7 ) ( 5 x + 8 + 7 )
K = ( 5 x + 1 ) ( 5 x + 15 )
K = 5 ( 5 x + 1 ) ( x + 3 )
L = ( 10 + 2 x + 1 ) ( 10 - 2 x - 1 )
L = ( 2 x + 11 ) ( - 2 x + 9 )