Réponses

2014-02-23T20:26:19+01:00
Bonsoir

E = 10x - 18x² -15 + 27x + (4x² -12x +9)
10x -18x² -15 +27x +4x² -12x +9
-14x² +25x - 6

(2x-3)(5-9x +2x-3)
(2x-3)(-7x +2)

pour x = 2
(4-3)(-14+2) = 1 x - 12 = -12

pour x = 5/9
(10/9 -3)( - 35/9 +2)
(10/9 - 27/9) ( -35/9 + 18/9)
- 7/9 x - 17/9
= 119/81

(2x-3)(-7x +2) = 0
soit 2x -3 = 0
2x = 3
x = 3/2

soit -7x +2 = 0
-7x = -2
x = 2/7