Réponses

  • Utilisateur Brainly
2014-03-26T18:40:20+01:00
A. (3x+4)(2x+9)+(4x+2)(3x+6)
=6x²+27x+8x+36+12x²+24x+6x+12
=18x²+65x+48

d. (8x+4)(2x-3)+(2x-4)(5x+4)
= 16x²-24x+8x-12+10x²+8x-20x-16
= 26x²-28x-28