Réponses

2014-01-12T15:25:32+01:00
On considere l'expression A=(x+2)(x-2)+2(x+2)
1- factoriser
A=(x+2)(x-2)+2(x+2)
=(x+2)(x-2+2)
=x(x+2)

2- developper et reduire A
A=(x+2)(x-2)+2(x+2)
=x²-4+2x+4
=x²+2x

3- calculer A pour
x=0
0²+2*0
=0

x=-2
(-2)²+2(-2)
=4-4
=0