Réponses

2012-11-11T17:02:06+01:00

(2x-5)-3(x+7)-(x+4)(-3x+1) = 2x - 5 - 3x - 21 - [-3x² +x - 12x + 4] = -x -26 + 3x² - x + 12x - 4 = 10x + 3x² - 30 = 3x² + 10x - 30

2012-11-11T17:02:31+01:00

2x-5-3x-21-(-3xcarré+x-12x+4)

= 2x-5-3x-21+3xcarré-x+12x-4

=3xcarré +11x - 30