Réponses

2013-10-15T21:38:34+02:00
(2x-3)au carré-(2x-3)(x-2)-2xau carré=4(-5x+3)+3(4x-2)

(2x-3)² - (2x -3)(x-2) -2x² = (-20x +12) + ( 12x -6)
(4x² -12x +9) - (2x² -4x -3x +6) -2x² = -20x +12 +12x -6
4x² -12x +9 -2x² +4x +3x -6 -2x² = -20x +12 +12x -6
-5x +3 = - 8 x +6
-5x +8x = 6 -3
3x = 3
x = 1
2013-10-15T21:41:21+02:00
(2x-3)²-(2x-3)(x-2)-2x²=4(-5x+3)+3(4x-2)
4x²-12x+9-(2x²-4x-3x+6)-2x²= -20x+12+12x-6
4x²-2x²-2x²-12x+4x+3x+20x-12x=12-6-9+6
3x= 3
x= 3
/3
x= 1