Réponses

2013-10-24T15:13:34+02:00
2) 
3(2x+1)-(x-4)(2x+1)
(2x+1)(3-(x-4))
(2x+1)(7-x)
2013-10-24T15:29:02+02:00
Bonjour
factoriser 
1)
4x²-16+(2x+3)(x-2)
comme 4x² -16 = ( 2x-4)(2x+4) = (x-2)(2)(2x+4) = (x-2)(4x+8)
(x-2)(4x+8) - (2x+3)(x-2)
(x-2)(4x+8+2x+3)
(x-2)(6x+11) 
2)
(6x+3) -(x-4)(2x+1)
3(2x+1) -(x-4)(2x+1)
(2x+1)( 3-x+4)
(2x+1)(7-x)