URGENT !!! Développer les expressions suivantes 12 x ( b+2) = 4 x (3b+8)= b x (3b+4)= -8b x (6+9b)= 9 x (2b-1)= 9 x (2b-1)= -6 x (2b+7)= 8b x (3b-2)= -7 x (10-b)=
12 x ( b+2) = 12b + 24 4 x (3b+8)= 12b + 32 b x (3b+4)= 3b² + 4b -8b x (6+9b)= - 48b - 72b² 9 x (2b-1)= 18b-9 9 x (2b-1)=18b-9 -6 x (2b+7)= -12b-42 8b x (3b-2)= 24b²-16b -7 x (10-b)= -70 + 7b
