Réponses

2012-10-11T20:23:54+02:00

A=(x+1)(x-3)+2(x+1)

=(x²-3x+x-3)+(2x+2)

=x²-2x-3+2x+2

=x²-2x+2x-3+2

=x²-1

2012-10-11T20:25:28+02:00

A= (x^2-3x+x-3)(2x+2)=(2x^2-2x-3)(2x+2)=4x^3+4x^2-4x^2-4x-6x-6

 

A=4x^3-10x-6

bonne chance