Réponses

Meilleure réponse !
2013-01-26T17:09:46+01:00

(x+1)(x-8)=x²-8x+x-8=x²-7x-8

(2x-4)(9x+12)=18x²+24x-36x-48=18x²-12x-48

2013-01-26T17:10:04+01:00

(x+1)(x-8) = x²-8x+x-8

= x²-7x-8

 

(2x-4)(9x+12)

= 18x²+24x-36x-48

= 18x²-12x-48