Réponses

2014-01-12T14:04:57+01:00
A = (3x+1)²
A = 9x² + 6x +1

B = (7-x)²
B = 49 - 14x + x²

C = (9-5x)(9+5x)
C = 81-25x²
merci beaucoup
D= ( 1-4y )(1+4y )
tu ma beaucoup aider merco
merci*
Voila
2014-01-12T14:37:59+01:00
A)(3x+1)²
=9x²+6x+1

b)(7-x)²
=49-14x+x²

c)(9-5x)(9+5x)
=81-25x²