Réponses

2013-03-07T20:43:25+01:00

9 - 4x² = 9 +6x -6x- 4x²

 

            = 9 - 4x²

2013-03-07T21:57:57+01:00
9-4x^2 = 9+6x-6x-4x^2
9-4x^2 = 9-4^2
Je comfirme ;p