Réponses

Meilleure réponse !
2013-11-20T13:51:06+01:00
B= (5x + 3 ) (5x+3) - 4
=(5x+3)²-2²
=(5x+3-2)(5x+3+2)
=(5x+1)(5x+5)
=5(5x+1)(x+1)

C= 9(7x - 1 )² - 16x²
=[
3(7x - 1 )]² - (4x)²
=(21x-3-4x)(21x-3+4x)
=(17x-3)(25x-3)