Réponses

2014-10-05T18:35:21+02:00
A = (x+1)(x-4) +(x+3)(x-1)
a = x²-4x+x-4 +x² -x +3x-3
a =x²+x² -4x+x-x+3x -4-3
a = 2x² -x -7

b = (x+1)² -(x +3)(x-5)
b = x²+2x+2 - ( x²-5x+x²-15)
b = x²+2x+2 -(2x²  -5x -15
b = x² +2x+2 -2x² +5x +15
b =  -x² +7x +17