Réponses

2014-01-25T10:36:52+01:00
A(x)= (2x+3)² - (x-1)² 
=(2x+3-x+1)(2x+3+x-1)
=(x+4)(3x+2)

B(x)= (x+1) - x(x+1) 
=(x+1)(1-x)