Réponses

2014-02-12T18:37:32+01:00
(x-4)-(2+4x) = x -4 -2 -4x = -3x -6
4-(x² +5x-8) = 4 -x² -5x +8 = -x² -5x +12
(x+2)(x+6) = x² +6x +2x +12 = x² +8x +12
2(x+3)-(x+4) = 2x+6x-x -4 = 7x -4