Réponses

2013-03-03T16:47:20+01:00

a)  x2-2x+4 - x2 = 0

-2x+4 =  0

-2x=-4

x = 4/2=2

 

 

2013-03-03T16:49:41+01:00

Solution impossible, car :

 

(x-2)² - x² = 0

(x-2)²=x²

 

x-2 /= x