Réponses

2012-10-22T21:31:49+02:00

(3x-4)(x-6)-(x-6)-(x-6)(2x+7)-3x(x-6)

=(x-6)(3x-4-1-2x-7-3x)

=(x-6)(-2x-12)

=-2(x-6)(x+6)

ou

(3x-4)(x-6)-(x-6)-(x-6)(2x+7)-3x(x-6)

=3x²-18x-4x+24-x+6-(2x²+7x-12x-42)-(3x²-18x)

=3x²-18x-4x+24-x+6-2x²-7x+12x+42-3x²+18x

=-2x²+72

=-2(x²-36) [a²-b²=(a-b)(a+b)]

=-2(x-6)(x+6)

2012-10-22T21:36:03+02:00

ou prends ton cahier de leçon..sa ira plus vite! ;)