Répondre :
(x-3)(2x+1)-5x(2x+1)
1) 2x²+x-6x-3-10x²-5x
-8x²-10x-3
2) (2x+1)(x-3-5x)
(2x+1)(-4x-3)
1) 2x²+x-6x-3-10x²-5x
-8x²-10x-3
2) (2x+1)(x-3-5x)
(2x+1)(-4x-3)