Réponses

2012-12-12T16:41:36+01:00

a²-b²= (a-b)*(a+b)

 

((3x+4)-(x-6))*((3x+4)+(x-6))=(2x+10)*(4x-2)=8x²-4x+40x-20=8x²+36x-20

=2x²+9x-5