Réponses

2014-02-18T17:59:58+01:00
A = (2x+1) (x-5) -4(2x+1) (x+7)

= (2x+1) (x-5 -4(x+7))
=(2x+1) (x-5-4x-28)
= (2x+1) (-3x-33)

B = 8x²y - 4xy²

= 4xy (2x-y)

C = 4x²+12x+9
= (2x+3)²