Réponses

Meilleure réponse !
2014-05-23T16:28:28+02:00
1)
a) 4x²+4
= 4(x²+1)

b) 8-2a
= 2(4-a)

c) 5xy-10x
= 5x(y-2)

2)
A = -7(x-2)
A = -7x+14

B = (4x+5)(x+3)
B = 4x²+12x+5x+15
B = 4x²+17x+15

C = (9+x)(3x-1)
C = 27x-9+3x²-x
C = 3x²+26x-9

D = (6x-2)(5x-3)
D = 30x²-18x-10x+6
D = 30x²-28x+6