Réponses

2014-02-18T20:53:33+01:00
C= (5x-3)² + 4x(1-3x)    = 25x² -30x +9 + 4x -12x² =13x²-26x +9

 D= (4-6x)² + (5-8x)(5x+8)  = 16 - 48x +36x² + 25x +40 -40x² -64x = -4x² -87x +56

E=(2x-3) (2x+3)-(1+x)²  = 4x² +6x -6x -9 -1-2x -x² = 3x² -2x -10
2014-02-18T20:56:06+01:00
C= (5x-3)² + 4x(1-3x)
c= 5x²-5xX2X(-3)-3²+[4xX1-4xX3x]
c=5x²+30x-9+4x-12x²
c= -7x²+34x-9