Réponses

2014-09-27T13:48:56+02:00
(x+3)(5x-1)-(x²-9)
(x+3)(5x-1)-(x+3)(x-3)
(x+3) [(5x-1)-(x-3)]
(x+3)(5x-1-x+3)
(x+3)(4x+2)