Réponses

2014-03-28T14:15:36+01:00
Bonjour

E = 4x² - 12x +9 - (10x² -15x -18x +27)
E = 4x² -12x +9 -10x² +15x +18x -27
E = - 6x² +21x -18

factorisation
(2x-3)(2x-3 - 5x +9)
(2x-3)( -3x +6)
2014-03-28T14:17:45+01:00
E=(2x-3)²- (5x-9)(2x-3) 
E=4x
²-12x+9-(10x²-15x+27)
E= 4x²-12x+9-10x²+15x-27
E=-6x²+3x-18

Factorisation
E=(2x-3)²- (5x-9)(2x-3)  on met en facteur 2x-3
E=(2x-3)[(2x-3)-(5x-9)]
E=(2x-3)(2x-3-5x+9)
E=(2x-3)(-3x+6)
E=3(2x-3)(-x+2)