Sagot :
bonsoir
(5x+7)*(-7x+9)+(-7x+9)*(4x-4)
= ( - 7 x + 9 ) ( 5 x + 7 + 4 x - 4 )
= ( - 7 x + 9 ) ( 9 x + 3 )
= 3 ( - 7 x + 9 ) ( 3 x + 1 )
bonsoir
(5x+7)*(-7x+9)+(-7x+9)*(4x-4)
= ( - 7 x + 9 ) ( 5 x + 7 + 4 x - 4 )
= ( - 7 x + 9 ) ( 9 x + 3 )
= 3 ( - 7 x + 9 ) ( 3 x + 1 )