Réponses

2013-11-03T13:13:34+01:00
* (4x+5)(x-7)+4x+5
=(4x+5)(x-7+1)
=(4x+5)(x-6)

*(2x-7)²-(-8x+3)(2x-7)
=(2x-7)(2x-7)-(-8x+3)(2x-7)
=(2x-7)(2x-7-(-8x+3)
=(2x-7)(10x-10)