Réponses

2013-01-05T11:26:34+01:00

A=(x+1)(x-4)+3(x+1)

A=(x+1)(x-4+3)

A=(x+1)(x-1)

 

B=[(3x)²-5²]+( 2*3x + 2*5)

B=(3x-5)(3x+5)+2(3x+5)

B=(3x+5)(3x-5+2)

B=(3x+5)(3x-3)

B=3(3x+5)(x-1)