Réponses

2013-05-04T13:12:12+02:00

A = (x - 6)(x - 7) - (3x - 6)²

A = x² - 7x - 6x + 42 - (9x² - 36x + 36)

A = x² - 13x + 42 - 9x² + 36x - 36

A = -8x² - 23x + 6