Réponses

2012-11-07T17:30:12+01:00

2x²-2x-3x+3-14x²+21x-4x+6=-12x²+14x+9

 

 

(2x-3)[(x-1)-(7x+2)]

(2x-3)(x-1-7x-2)

(2x-3(-6x-3)

 

 

(-4-3)(-2-1)-(-14+2)(-4-3) = 8+4+6+3-56-42+8+6=-63