Réponses

2012-12-11T17:48:17+01:00

A = (x+3)² -(x-3)²

A = x² +6x +9 - (x² -6x +9)

A = x² +6x +9 -x² +6x -9 = 12x

  • Utilisateur Brainly
2012-12-11T18:09:14+01:00

(x+3)²-(x-3)² =(x+3+x-3)(x+3-x+3)=(2x)(6)=12x


donc (50+3)²-(50-3)² vaut 600