Réponses

Meilleure réponse !
2014-10-04T20:46:05+02:00
B= 4(x+9)-(7+x)(x+1)
B= 4x+36-(7x+7+x²+x)
B= 4x+36-7x-7-x²-x
B= -x²-4x+29

C= -2(1-3x)-(3x+2)(x-5)
C= -2+6x-(3x²-15x+2x-10)
C= -2+6x-3x²+15x-2x+10
C= -3x²+19x+8

D= -3(a²+2)-(a-3)(2a+7)
D= -3a²-6-(2a²+7a-6a-21)
D= -3a²-6-2a²-7a+6a+21
D= -5a²-a+15