Réponses

Meilleure réponse !
  • Utilisateur Brainly
2014-06-15T17:33:12+02:00
2014-06-15T18:08:59+02:00
5x² + 2 (4x + 8)
= 5x²+8x+16

(7x - 3) (7x +3) -2 (x + 5)² 
= 49x
²-9-2(x²+10x+25)
= 49x²-9-2x²-20x-50
47x²-20x-59