Réponses

2014-04-18T10:44:01+02:00
Surface S = x²

Nouvelle surface = (x+3)² = x² + 6x + 9

Nouvelle surface - surface initiale = x²+6x+9-x² = 6x+9 = 3(2x+3)

Si x = 8, augmentation de 3(2*8+3) = 57