Réponses

2014-02-01T21:15:33+01:00
Bonsoir

3x² -15x  +1 = 3(x-2)(-5+x)
3x² -15x +1 = 3x -6 ( -5 +x)
3x² -15x +1 = -15x +3x² +30 - 6x
3x² -3x² -15x +15x -30x +6x = -1
-24x = -1
x = 1/24

(2 -8x)(3x-5) - 12(3 -2x²) = 0
6x -10 - 24x² +40x - 36 + 24x² = 0
46x - 46 = 0
46x = 46
x = 1