Réponses

2014-05-04T10:06:56+02:00
(5-3x)²= (10-x)²
= -9x² - 30x - 25
= -x² - 20x +100
= -9x² + x² - 30x + 20x - 25 - 100 = 0
= -8x² - 10x - 125
2014-05-04T10:21:47+02:00
Bonjour!
(5-3x)²= (10-x)² 
= -9x² - 30x - 25
 = -x² - 20x +100
= -9x² + x² - 30x + 20x - 25 - 100 = 0
= -8x² - 10x - 125