Réponses

2013-10-21T18:28:39+02:00
A = (6x+2)²
   =36x²+24x+4
B = (7x-4)²
   =49x²-56x+16
C = (2x+9)(2x-9)
   = 4x²-18x+18x-81
   =4x²-81
D = (3x-5)(x+2)+(3x+2)²
   = 3x²+6x-5x-10+9x²+12x+4
   =12x²+13x-6