Réponses

  • Utilisateur Brainly
2014-04-30T14:48:39+02:00
1) 20²-x² =
   400-x²

2) 400-x² = 350
     -x² = -400+350
     x² = 50
     x =V50 = 5V2

400-x² =
400-(5V2)² =
400-50 = 350