Réponses

2013-01-14T18:24:08+01:00

A = x²-x+3x-3+6x+3

= x² +8x

 

si x = 0 alors A = 0

si x = -8 alors A = 64-64 = 0

si x = V2 alors A = 2+8V2 = 10V2

2013-01-14T18:27:24+01:00

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

A=x²-x+3x-3+6x+3

A=x²+8x

 

pour x=0               pour x= -8                             pour x=racine carrée de 2

A=x²+8x                    A=x²+8x                                    A=x²+8x

A=0²+8x0                 A=8²+8x(-8)                             A= (racine carrée de 2)²+8(racine carrée de 2)

A=O                           A=64-64                                  A=2+8(racine carrée de 2) (environ 11,3 si tu dois

                                  A=O                                           arrondir)

                                                                                      A= environ 13,3

 

Voila! Bonne soirée!^^