Réponses

Meilleure réponse !
2013-04-07T12:48:57+02:00

(3x-1)(5x+2) = 15x²+6x-5x-1 = 15x²-5x+5

(x+3)(x-2)=x²-2x+3x-6=x²+x-6

(x+3)(4x-7)=4x²-7x+12x-21=4x²+5x-21

(4x-2)(x-5)=4x²-20x-2x+10=4x²-22x+10

(8x-4)(5x-1)=40x²-8x-20x+4=40x²-20x+4

(3x-3)(5x-2)=15x²-6x-15x+6=15x²-21x+6