Réponses

2014-05-05T19:09:08+02:00
4x² - 9 = (2x+3)(2x-3)
4x²-9+(2x+3)(x-1) = (2x+3)(2x-3) + (2x+3)(x-1) = (2x+3)(2x-3+x-1) = (2x+3)(3x-4) 
(2x+3)(3x-4) = 0 => 2x+ 3 = 0 => x = -3/2
                        => 3x-4 = 0 => x = 4/3