Réponses

2014-05-06T17:14:44+02:00
(x+2)² -3(x-1)(x-3)
=x²+4x+4-3(x²-3x-x+3)
=x²+4x+4-3x²+9x+3x-9
=-2x²+16x-5
2014-05-06T17:15:57+02:00
(x+2) ²-3(x-1)(x-3)
x²+4x+4 -3(x²-3x-x+3)
x²+4x+4 -3x²+9x+3x-9
-2x²+16x -5