Réponses

Meilleure réponse !
2013-04-27T11:34:13+02:00

Bonjour,

 

A = (x-4)(2x+1) + (x²-16) =

 

A = (x-4)(2x+1) + (x+4)(x-4) =

 

A = (x-4)(2x+1+x+4) =

 

A = (x-4)(3x+5)

   
2013-04-27T11:38:58+02:00

x X 2x + x X 1  - 4 X 2x +4 X 1+ x^2-16

=2x^2 + 1x - 8x + 4 + x^2 - 16

=3x^2 + (-7x) + ( -12)

=3x^2-7x-12