Réponses

2012-05-01T18:24:59+02:00

a) 2x²-5x = (2x-5)(2x+4)

=2x(-5+4)

 

b) 4(x-1)²-(x+1)²

=(2(x-1)-(x+1))²

=(2(x-1)-x-1)²

 

c) (2x+1)²-4x-2+(4x²-1)
(2x+1)²-(2)²x-2