Réponses

2013-06-06T19:43:15+02:00

 A=(3x+1) (-2+3)

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

=-6x +9x-2+3

A=3x+1

 

voila tu as la méthode à suivre 

 

2013-06-06T19:47:21+02:00

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

A=-6x+9x-2+3

A=3x+1

 

 B=(4x-3) (8x-8)

B=32x²-32x-24x+24

B=32x²-56x+24

 

C=(-2x+4) (5x-5)

C=-10x²+10x+20x-20

C=-10x²+30x-20