Réponses

2013-12-15T17:41:46+01:00
Bonsoir

A=a(4 a-5) = 4a² -5a
B=(2 x-4)(x+7) = 2x² +14x -4x -28 = 2x² +10x -28

C=25b-15 = 5(5b -3)
D= (4 x-1) (2 x+3) + (x-7) (4 x-1)

(4x-1)((2x+3 + x-7)
(4x-1)( 3x -4)