Réponses

2013-09-15T10:31:08+02:00
A=(x-3)(2x-5)-3(2x-5)
A = 2x² -5x -6x +15 - (6x -15) = 2x² - 11 x +15 -6x +15 = 2x² - 17x +30

A ) (2x+5)(x-3) -3
= (2x+5)(x-3-3) = (2x+5)(x-6)
2013-09-15T10:33:13+02:00
A= ( x-3)(2x-5)-3 (2x-5)
2x au carrée -5x-6x+15-6x+15
2xai carré -17x+30

FACTORISER
(x-3)(2x-5)-3 (2x-5)
(2x-5)[(x-3)-3]
(2x-5) ( x-6)