Réponses

2014-03-01T16:25:45+01:00
Salut,

= 16-(5x-3)
= 3X4-(5x-3)
= 3 X 5x - 3 X 3
= 15x - 9
2014-03-01T16:43:34+01:00
Identité remarquable: a²-b² = (a-b)(a+b)

Donc 16 - ( 5x -3 )²
= (4-5x+3)(4+5x-3)
= (-5x+3+4)(5x-3+4)
= (-5x+7)(5x+1)

Voila pour ta factorisation