Bonsoir,
Exercice 1
3x + 9 = 3( x+3)
4x²+ 5x = = x( 4x+5 )
2x²+ 6x =
x( x+3 )
4ab ²+ 2ab + 8a²b = 2ab ( 2b + 1 + 4a)
3x + 8y = impossible
Exercice 2
4 (2x + 3) + 5x (2x + 3)
= (2x+3) (4 +5x)
(2x - 1)(x + 2) + 4 (2x - 1)
= (2x-1) ( x+2+4)
= (2x-1) ( x+6)
(x + 4) (4x - 2) - 3x (x + 4) =
= (x+4)( 4x-2 -3x)
= (x+4) ( x-2)
(x + 5)(2x + 3) + (x + 5) (2x - 4) =
(x+5) ( 2x+3 + 2x-4)
= (x+5 ( 4x -1)
(3x + 2) (x - 5) - (3x + 2) (3x - 4) =
= (3x+2) ( (x-5 -3x +4)
= (3x+2) ( -2x -1)
