Réponses

2013-03-04T14:25:30+01:00

A = (3x+3a)(x-3)

    = 3x²-9x+3ax-9a

 

B = (-6-2t)(t-7)

    = -6t+42-2t²+14t

    = -2t²+8t+42

 

C = -3y²+6y+15y-30

   = -3y²+21y-30

 

D = (2x²-6x)(2-x)

  = 4x²-2x^3-12x+6x²

= -2xcube +10x²-12x

2013-03-04T14:54:11+01:00

A= 3.(x²-3x+ax-3a)

A= 3x²-9x+3ax-9a

 

B= (-6-2t)(t-7)

B= -6t+42-2t²+14t

B= 8t+42-2t²

 

C= (-y-5)(3y-6)

C= -3y²+6y-15y+30

C= -3y²-9y+30

 

D=(2x²-6x)(2-x)

D= 4x²-2x³-12x+6x²

D= 10x²-2x³-12x