Réponses

2013-10-15T18:36:45+02:00
=(x^2-12x+36) - (x^2-13x+36)
=-x
attention au signe -12x+13x = x
ah oui merci de l'avoir remarqué
2013-10-15T18:48:25+02:00
(x - 6)² - (x - 4) (x - 9)
=x²-12x+36-(x²-9x-4x+36)
=x²-12x+36-x²+9x+4x-36
= x