Réponses

2014-03-23T14:11:11+01:00
A= 3x*4x+3x*5+(-1)*4x+(-1)*5-2*7x²+2*6
A= 12x²+15x-4x-5-14x²+12
A=-2x²+11x+7
Meilleure réponse !
2014-03-23T14:19:00+01:00
A=(3x-1)(4x+5)-2(7x²+6)
a=12x²+15x-4x-5-14x²-12
a= -2x²+11x-17

b=(2x-9)(x-10)+(6x+3)(5x-12)
b=2x
²-20x-9x+90+30x²-72x+15x-36
b=32x²-86x+54