Réponses

2014-10-29T19:45:24+01:00
(x)= (3x-2)² -3(x+2)(4x-3)
x =  9x²-12x+4 -3(4x²-3x+8x-6)
x =9x²-12x+4 -12x²+9x-24x+18
x =  -3x² -27x+22

2014-10-29T19:46:07+01:00
(3x-2)² -3(x+2)(4x-3)
= 9x
² + 4 - 12x - 3( 4x² -3x +8x -6)
= 9x² + 4 - 12x - 3 (4x² +5x -6)
= 9x² +4 -12x -12 x² -15x +18
= -3x² -27x  +22